Re: many outgoing tcp sockets are slower than a few

[Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>]

On Mon, Feb 21, 2005 at 11:36:14AM +0100, Christian Schmid wrote:

> Outgoing data. I am using sendfile() to send the file on a non-blocking 
> socket but the call blocks for 100 ms per socket if I get over 3000 
> sockets. Thats causing the massive slowdown in sum. I first thought its a 
> disk-issue but I tried with pure-cache data as well and it still blocks.

O_NONBLOCK send() is really nonblocking, but O_NONBLOCK sendfile()
really isn't, as it still does the disk read (if any) synchronously.

How are you making sure that you're sending "pure-cache data"?


--L