From owner-kaio@oss.sgi.com Mon Dec 13 14:06:23 1999
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From:   Christopher Smith <x@xman.org>
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Subject: KAIO and sockets?
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Hi there. I've been playing around with KAIO for a few weeks. Seems very
nice. I noticed it's aio_suspend() behavior is correct (as opposed to
glibc :-().

Today I tried using KAIO on a socket. I didn't get any error messages,
but I also most definitely did not succeed in either my reading or
writing operations. I understand that I can't possibly get the
split/phase optimization over ethernet, but I was hoping to be able to
use KAIO as a generic replacement for Glibc's rather broken AIO. Am I
doing something wrong or is this just not possible?

--Chris

From owner-kaio@oss.sgi.com Wed Dec 15 12:23:40 1999
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From:   ananth@madurai.engr.sgi.com (Rajagopal Ananth)
Message-Id: <199912152019.MAA142650@madurai.engr.sgi.com>
Subject: Re: KAIO and sockets?
To:     x@xman.org (Christopher Smith)
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In-Reply-To: <38556B1C.226055BD@xman.org> from "Christopher Smith" at Dec 13, 99 01:54:36 pm
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> 
> Hi there. I've been playing around with KAIO for a few weeks. Seems very
> nice. I noticed it's aio_suspend() behavior is correct (as opposed to
> glibc :-().
> 
> Today I tried using KAIO on a socket. I didn't get any error messages,
> but I also most definitely did not succeed in either my reading or
> writing operations. I understand that I can't possibly get the
> split/phase optimization over ethernet, but I was hoping to be able to
> use KAIO as a generic replacement for Glibc's rather broken AIO. Am I
> doing something wrong or is this just not possible?
> 

I have not looked into using sockets & KAIO ...
KAIO has mostly been tested with disk I/O. On the otherhand,
I can't think of a fundamental reason why sockets won't work;
perhaps some code may need tweaking, like the odd behaviour
we ran into with PIPEs. Is it possible for you send me
a (small) piece of test code that I can use to try out
the socket-KAIO behavior?

thanks!

ananth.

PS: I just returned from a long sabbatical leave, so if any I
    didn't reply to any mail in this forum for the last 6 weeks,
    please resend it.

From owner-kaio@oss.sgi.com Wed Dec 15 16:23:08 1999
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From:   Christopher Smith <x@xman.org>
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To:     Rajagopal Ananth <ananth@madurai.engr.sgi.com>
Cc:     kaio@oss.sgi.com
Subject: Re: KAIO and sockets?
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Rajagopal Ananth wrote:
> I have not looked into using sockets & KAIO ...
> KAIO has mostly been tested with disk I/O. On the otherhand,
> I can't think of a fundamental reason why sockets won't work;
> perhaps some code may need tweaking, like the odd behaviour
> we ran into with PIPEs. Is it possible for you send me
> a (small) piece of test code that I can use to try out
> the socket-KAIO behavior?
> 
> thanks!
> 
> ananth.
> 
> PS: I just returned from a long sabbatical leave, so if any I
>     didn't reply to any mail in this forum for the last 6 weeks,
>     please resend it.
Here's some really crummy C++ code (note I basically cut and pasted from
some class libraries ;-) which demonstrates a failure on a read of a
socket. If the code works properly, it should emulate a VERY simple HTTP
server. The important thing to note is that if you set KAIO_READ to 0
(and therefore don't use KAIO) the application appears to run properly.

My observations are that with KAIO the program reads zero bytes into the
buffer and does not block at all on kaio_suspend. Note I have seperate
code doing this on a file and it seems to work fine.

--Chris
--------------EC22C4346189CB0DA2B68A8A
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 filename="aio2.cpp"

#define BUFFER_SIZE 100
#define KAIO_READ 1

extern "C" {
#include <linux/aio.h>
}
#include <g++/stdiostream.h>
#include <g++/cstdlib>
#include <fcntl.h>
#include <g++/cerrno>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <time.h>

void socketTest(const int portNumber) {
  cout << "Initiating socket test" << endl;
  int mySocket = socket(PF_INET, SOCK_STREAM, 0);
  if (mySocket < 0) {
    cout << "Error creating socket" << strerror(errno) << endl;
    exit(1);
  }

  socklen_t addrLength = sizeof(struct sockaddr);
  struct sockaddr_in* socketAddress = 
    (struct sockaddr_in*) malloc (addrLength);

  socketAddress->sin_family = AF_INET;
  socketAddress->sin_port = htons(portNumber);
  inet_aton("127.0.0.1", &(socketAddress->sin_addr));
  int returnVal = bind(mySocket, (const struct sockaddr *) socketAddress, 
		       addrLength);

  if (returnVal < 0) {
    cout << "Error invoking bind" << strerror(errno) << endl;
    exit(1);
  }

  returnVal = listen(mySocket, 10);
  if (returnVal < 0) {
    cout << "Error invoking listen" << strerror(errno) << endl;
    exit(1);
  }
  int connectedSocket = accept(mySocket, (struct sockaddr *) socketAddress, &addrLength);
  if (connectedSocket < 0) {
    cout << "Error invoking accept" << strerror(errno) << endl;
    exit(1);
  }
  
  char* buffer = (char *) calloc(BUFFER_SIZE + 1, sizeof(char));
  
#if defined(KAIO_READ)

  int reader = recvfrom(connectedSocket, buffer, BUFFER_SIZE, 0, NULL, 0);
  if (reader == -1) {
    switch(errno) {
    case EAGAIN:
      cout << "Non-blocking" << endl;
      break;
    case ENOTCONN:
      cout << "Not connected" << endl;
      break;
    case ENOTSOCK:
      cout << "Not a socket" << endl;
      break;
    case EINVAL:
      cout << "Cannot read" << endl;
      break;
    case EBADF:
      cout << "Bad file descriptor" << endl;
      break;
    case EFAULT:
      cout << "Buffer is outside of address space" << endl;
      break;
    case EINTR:
      cout << "Interrupted" << endl;
      break;
    default:
      cout << "Error reading socket:" << strerror(errno) << endl;
    }
  }

#else

  struct aiocb* control = (struct aiocb*) malloc(sizeof(struct aiocb));
  int answer = 0;
  const struct aiocb** list = (const struct aiocb**) malloc(sizeof(struct aiocb*));
  struct timespec wait;
  
  control->aio_fildes = connectedSocket;
  control->aio_lio_opcode = LIO_READ;
  control->aio_buf = buffer;
  control->aio_nbytes = (size_t) 1000;
  control->aio_offset = 0;
  
  cout << "Doing read" << endl;
  answer = aio_read(control);
  if (answer < 0) {
    cout << "Error on read: " << strerror(errno) << endl;
    exit(0);
  }
  
  list[0] = control;
  wait.tv_sec = 100000;;
  wait.tv_nsec = 0;
  
  cout << "Suspending until complete\n";
  answer = aio_suspend(list, 1, &wait);
  if (answer < 0) {
    cout << "Error on suspend: " << strerror(errno) << endl;
    answer = aio_error(control);
    cout << "Error code: " << answer << endl << "Error string: " 
	 << strerror(answer);
    exit(0);
  }
  
  answer = aio_return(control);
  cout << "aio_return status is: " << answer << endl;
  cout << "Read: " << buffer << endl;

#endif
  
  char *nextLine;
  int line = 0;
  
  char **buff_p = &buffer;
  const char marker = '\n';
  do {
    nextLine = strsep(buff_p, &marker);
    cout << line++  << ": " << nextLine << endl;
  } while (nextLine != NULL);

  free(buffer);
  char *answer_buf = (char *) calloc(BUFFER_SIZE, sizeof(char));

  sprintf(answer_buf, "HTTP/1.1 200 OK\nDate: %s\nServer: Qhttpd\nConnection:close\nContent-Type: text/html\n\n<HTML>\n<HEAD>\n  <TITLE>This is a test</TITLE>\n</HEAD>\n<BODY>\n<H1>This is a test</H1>\n</BODY>\n", ctime(NULL));
  returnVal = sendto(connectedSocket, answer_buf, BUFFER_SIZE, 0, NULL, 0);
  close(connectedSocket);
  close(mySocket);
}

int main(int argc, char** argv) {
  const int portnumber = (argc > 1) ? atoi(argv[1]) : 1234;
  if (portnumber > 0) {
    socketTest(portnumber);
  } else {
    printf ("Invalid port number: %d", portnumber);
  }
}

--------------EC22C4346189CB0DA2B68A8A--


From owner-kaio@oss.sgi.com Wed Dec 15 18:34:40 1999
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Date:   Wed, 15 Dec 1999 18:31:07 -0800
From:   Ananth Ananthanarayanan <ananth@sgi.com>
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Christopher Smith wrote:
> 
> I noticed a VERY small problem with the KAIO patch when applied to the
> latest 2.2 kernel. So, I put together this new patch which fixes the
> problem. Let me know if anyone has any problems.
> 
> BTW, has anyone tried porting this to 2.3.x and sending it to Linus?
> This seems like a very nice feature (particulary since glibc AIO is both
> slow and buggy), particularly when combined with RAW I/O.
> 
> --Chris

Chris,

For some reason your patch contains extra files with .orig extensions;
i gues you had some "saved" copies lying around when you ran the diff.
Due to this, the patch you sent out has 8000+ lines of diff, whereas
the original kaio-kern-1.0 has only 2000+ lines of diff. I tried
manually editing out the .orig diffs, but still couldn't find what
exactly your changes were. Can you please sending a corrected
version of the patch? Also, if the differences are not big,
could you also send the diffs (in text) in your reply.

Also, re: your question about 2.3.X ... this is one of the highest
priority items on my todo lists. Note that most of the changes
come in large chunks, so I'm hoping(!) that we can get away with
porting a significant portion of the code. I'm also happy to
see you find KAIO to be an improvement over glibc AIO.
I hope to get such feedback before pushing the patches onto linux-kernel
mailing list & thence to Linus et.al. If you (or anyone else
reading this message) has a quantification of KAIO vs. glibc-aio
w.r.t. performance or posix-compliance (or just difficult bugs),
that information will greatly influence in getting KAIO into kernel
proper.

regards,

ananth.

PS: btw, I'm having some logistical problem in trying to use my latest
kernel
     on my test system, so i haven't tried the socket test yet.

From owner-kaio@oss.sgi.com Wed Dec 15 19:23:10 1999
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To:     Ananth Ananthanarayanan <ananth@sgi.com>
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Subject: Re: Updated patch.
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Ananth Ananthanarayanan wrote:
> For some reason your patch contains extra files with .orig extensions;
> i gues you had some "saved" copies lying around when you ran the diff.
> Due to this, the patch you sent out has 8000+ lines of diff, whereas
> the original kaio-kern-1.0 has only 2000+ lines of diff. I tried
> manually editing out the .orig diffs, but still couldn't find what
> exactly your changes were. Can you please sending a corrected
> version of the patch? Also, if the differences are not big,
> could you also send the diffs (in text) in your reply.
Patch fixed. It just takes into account a very minor change in sched.h,
as well as some line number changes. This one is almost exactly the same
size as yours.

> Also, re: your question about 2.3.X ... this is one of the highest
> priority items on my todo lists. Note that most of the changes
> come in large chunks, so I'm hoping(!) that we can get away with
> porting a significant portion of the code. I'm also happy to
> see you find KAIO to be an improvement over glibc AIO.
> I hope to get such feedback before pushing the patches onto linux-kernel
> mailing list & thence to Linus et.al. If you (or anyone else
> reading this message) has a quantification of KAIO vs. glibc-aio
> w.r.t. performance or posix-compliance (or just difficult bugs),
> that information will greatly influence in getting KAIO into kernel
> proper.
Well, I can safely say that glibc AIO doesn't seem to do aio_suspend()
as it should (it's never successfully blocked for me). I didn't have
much more luck with the signal structure, although that's conceivably
due to coding errors on my part. KAIO hasn't caused me one bit of
trouble (beyond the pending socket issue) and of course we know it
performs well (I haven't reached the stage where I've quantified that
yet).

--Chris
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--------------9E14815AB428721A5BC99D99--


From owner-kaio@oss.sgi.com Fri Dec 17 17:27:10 1999
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Date:   Fri, 17 Dec 1999 17:15:28 -0800
From:   Christopher Smith <x@xman.org>
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To:     Ananth Ananthanarayanan <ananth@sgi.com>, kaio@oss.sgi.com
Subject: Re: [Fwd: KAIO & sockets: a correction]
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Ananth Ananthanarayanan wrote:
> 
> I sent that mail again to kaio@oss.sgi.com, but
> still haven't received even my copy, so I'm
> trying to send it to you directly. Please
> let me know if you get this message.
> 
> thanks,
> 
> ananth.
> 
>   ------------------------------------------------------------------------
>
> Chris Smith's program to test KAIO & sockets brought
> out a problem in the interaction between KAIO code
> and socket code. In a way the problem is similar
> to the one already fixed in the PIPE code. This
> time, though, I think it should be OK to change
> the KAIO code that calls into the socket layer
> (also the same KAIO code that calls into PIPE).
> 
> The chages are only a couple of lines of code, so
> I'm going to append it to the end of this message.
> 
> Finally, noticed that the socket test was calling
> aio_return() without first checking aio_error(),
> whereas, aio_error() should be called first,
> and only when it returns 0 can aio_return be called.
> Note that till the I/O complete aio_error() can
> return EINPROGRESS, although in Chris' test aio_suspend
> precludes this possiblity.
Added the code for aio_error(). Thanks for pointing it out.
 
> Chris, can you let me know if you are able to apply
> the following fix & if it works for you?
I applied the 2 line change  you sent (didn't try the patch but I assume
it's the same). It appears to work wonderfully.

--Chris

P.S.: I attached an updated version of the aio2.cpp code.
--------------C3B2E99417360E6CC9D74CE5
Content-Type: image/x-xbitmap;
 name="aio2.cpp"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="aio2.cpp"

#define BUFFER_SIZE 100
#define KAIO_READ 1

extern "C" {
#include <linux/aio.h>
}

#include <g++/stdiostream.h>
#include <g++/cstdlib>
#include <fcntl.h>
#include <g++/cerrno>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <time.h>

void socketTest(const int portNumber) {
  cout << "Initiating socket test" << endl;
  int mySocket = socket(PF_INET, SOCK_STREAM, 0);
  if (mySocket < 0) {
    cout << "Error creating socket" << strerror(errno) << endl;
    exit(1);
  }
  
  socklen_t addrLength = sizeof(struct sockaddr);
  struct sockaddr_in* socketAddress = 
    (struct sockaddr_in*) malloc (addrLength);
  
  socketAddress->sin_family = AF_INET;
  socketAddress->sin_port = htons(portNumber);
  inet_aton("127.0.0.1", &(socketAddress->sin_addr));
  int returnVal = bind(mySocket, (const struct sockaddr *) socketAddress, 
		       addrLength);
  
  if (returnVal < 0) {
    cout << "Error invoking bind" << strerror(errno) << endl;
    exit(1);
  }
  
  returnVal = listen(mySocket, 10);
  if (returnVal < 0) {
    cout << "Error invoking listen" << strerror(errno) << endl;
    exit(1);
  }
  int connectedSocket = accept(mySocket, (struct sockaddr *) socketAddress, &addrLength);
  if (connectedSocket < 0) {
    cout << "Error invoking accept" << strerror(errno) << endl;
    exit(1);
  }
  
  char* buffer = (char *) calloc(BUFFER_SIZE + 1, sizeof(char));
  
#if defined(KAIO_READ)
  
  int reader = recvfrom(connectedSocket, buffer, BUFFER_SIZE, 0, NULL, 0);
  if (reader == -1) {
    switch(errno) {
    case EAGAIN:
      cout << "Non-blocking" << endl;
      break;
    case ENOTCONN:
      cout << "Not connected" << endl;
      break;
    case ENOTSOCK:
      cout << "Not a socket" << endl;
      break;
    case EINVAL:
      cout << "Cannot read" << endl;
      break;
    case EBADF:
      cout << "Bad file descriptor" << endl;
      break;
    case EFAULT:
      cout << "Buffer is outside of address space" << endl;
      break;
    case EINTR:
      cout << "Interrupted" << endl;
      break;
    default:
      cout << "Error reading socket:" << strerror(errno) << endl;
    }
  }
  
#else
  
  struct aiocb* control = (struct aiocb*) malloc(sizeof(struct aiocb));
  int answer = 0;
  const struct aiocb** list = (const struct aiocb**) malloc(sizeof(struct aiocb*));
  struct timespec wait;
  
  control->aio_fildes = connectedSocket;
  control->aio_lio_opcode = LIO_READ;
  control->aio_buf = buffer;
  control->aio_nbytes = (size_t) 1000;
  control->aio_offset = 0;
  
  cout << "Doing read" << endl;
  answer = aio_read(control);
  if (answer < 0) {
    cout << "Error on read: " << strerror(errno) << endl;
    exit(0);
  }
  
  list[0] = control;
  wait.tv_sec = 100000;;
  wait.tv_nsec = 0;
  
  cout << "Suspending until complete\n";
  answer = aio_suspend(list, 1, &wait);
  if (answer < 0) {
    cout << "Error on suspend: " << strerror(errno) << endl;
    answer = aio_error(control);
    cout << "Error code: " << answer << endl << "Error string: " 
	 << strerror(answer);
    exit(0);
  }

  answer = aio_error(control);
  if (answer != 0) {
    cout << "Error on AIO operation: " << strerror(answer) << endl;
    exit(0);
  }
  
  answer = aio_return(control);
  cout << "aio_return status is: " << answer << endl;
  cout << "Read: " << buffer << endl;
  
#endif
  
  char *nextLine;
  int line = 0;
  
  char **buff_p = &buffer;
  const char marker = '\n';
  do {
    nextLine = strsep(buff_p, &marker);
    cout << line++  << ": " << nextLine << endl;
  } while (nextLine != NULL);
  
  free(buffer);
  char *answer_buf = (char *) calloc(BUFFER_SIZE, sizeof(char));
  
  sprintf(answer_buf, "HTTP/1.1 200 OK\nDate: %s\nServer: Qhttpd\nConnection:close\nContent-Type: text/html\n\n<HTML>\n<HEAD>\n  <TITLE>This is a test</TITLE>\n</HEAD>\n<BODY>\n<H1>This is a test</H1>\n</BODY>\n</HTML>\n", ctime(NULL));
  returnVal = sendto(connectedSocket, answer_buf, strlen(answer_buf), 0, NULL, 0);
  cout << "Returned with: " << returnVal << endl;
  cout << "Length: " << strlen(answer_buf) << endl;

  close(connectedSocket);
  close(mySocket);
}

int main(int argc, char** argv) {
  const int portnumber = (argc > 1) ? atoi(argv[1]) : 1234;
  if (portnumber > 0) {
    socketTest(portnumber);
  } else {
    printf ("Invalid port number: %d", portnumber);
  }
}

--------------C3B2E99417360E6CC9D74CE5--


From owner-kaio@oss.sgi.com Mon Dec 20 11:40:08 1999
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Date:   Mon, 20 Dec 1999 11:37:44 -0800 (PST)
From:   Matt Robinson <yakker@cthulhu.engr.sgi.com>
To:     kaio@oss.sgi.com
Subject: Testing Archive - Please Ignore
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I've uploaded the next revision of patches,
kaio-1.1 into http://oss.sgi.com/projects/kaio.
Please check news & download sections for changes.
A problem with the mail archive has also been
corrected (see the link in mailing list section).

Thanks to Chris Smith & Robert de Vries
for pointing out bugs in version 1.0.

Give 1.1 a try and let me know how things turn out.

Next up, generating patches for linux 2.3 kernels ...

ananth.

From owner-kaio@oss.sgi.com Wed Dec 22 20:31:39 1999
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Ananth Ananthanarayanan wrote:
> 
> I've uploaded the next revision of patches,
> kaio-1.1 into http://oss.sgi.com/projects/kaio.
> Please check news & download sections for changes.
> A problem with the mail archive has also been
> corrected (see the link in mailing list section).
> 
> Thanks to Chris Smith & Robert de Vries
> for pointing out bugs in version 1.0.
Thanks for the thanks!!! I feel like a real contributor now! ;-)
 
> Give 1.1 a try and let me know how things turn out.
It works fine for me! Glad to see we've got full socket support now! ;-)

--Chris