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Re: High number of concurrent connections causes 2.6.4 to go berserk

To: Christopher Chan <cchan@xxxxxxxxxxxx>
Subject: Re: High number of concurrent connections causes 2.6.4 to go berserk
From: Nivedita Singhvi <niv@xxxxxxxxxx>
Date: Thu, 01 Apr 2004 19:28:53 -0800
Cc: netdev@xxxxxxxxxxx, Yusuf Goolamabbas <yusufg@xxxxxxxxxxxx>
In-reply-to: <406CBA60.50103@xxxxxxxxxxxx>
References: <406CBA60.50103@xxxxxxxxxxxx>
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Christopher Chan wrote:

When tcp_max_syn_backlog is set to 4096 and
route.max_size = 131072
route.gc_thresh = 65536

the box goes berserk almost immediately after bootup due to a bounce flood hitting the box.

The below values seem to workaround whatever problem the kernel has.

tcp_max_syn_backlog = 2048
route.max_size = 1048576
route.gc_thresh = 65536

Did you try just one of the first two and see which
one actually made a difference? I'm assuming the first,
but that might not be the case..

thanks,
Nivedita




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