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To: Matthias-Christian Ott <matthias.christian@xxxxxxxxxx>
Subject: Re: ARGH MORE BUGS!!!
From: Christian Schmid <webmaster@xxxxxxxxxxxxxx>
Date: Mon, 21 Feb 2005 21:25:34 +0100
Cc: netdev@xxxxxxxxxxx
In-reply-to: <421A4244.9090908@xxxxxxxxxx>
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netdev@xxxxxxxxxxx has been found in MAINTAINERS in the ipv4/ipv6 section ;)

Matthias-Christian Ott wrote:
Christian Schmid wrote:


Another bug hit me today HARD! I have been experiencing with lowering the socket-buffer to see if the behaviour of a slowdown reappears at the same position. Result: With a 128 KB send-buffer, the slowdown appears at around 3000 sockets. With 64 KB, it didnt appear up to 4500 sockets where a small slow-down appeared but I think this was a disk-issue. So its definetly something with TCP-memory.

But now I hit another BUG: After I have managed to create 4500 sockets, 10 minutes later an interesting phenomenon appeared: It locks for 5 seconds every 60 seconds. I first thought this was something in my program but I can do what I want, I wasn't able to fix this. Even a restart of my program didnt help. It even appears with 400 connections. Then I despairedly just restarted the system and: It was gone. So what is THIS?

Sorry if I am a bit angry. I know you are doing a really good job. Maybe I can donate some money somewhere but PLEASE!!!!! help me fix this bugs.... Thank you.


I'm not a Perl Coder or Socket Specialist, but did try an implementation of your program in C (maybe it's a perl "bug"?)? And as mentioned in the other Thread, try to use send () instead of sendfile (). Anyway it's strange. Try to contact some of the Maintainers and Developers of this part of the IP v4 implementation in Linux.

Matthias-Christian Ott

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