netdev - Re: TCP connection stops after high load.

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Message-ID: <7e63f56c0704150849r5b019962v296b4266021a6fe1@mail.gmail.com>
Date:	Sun, 15 Apr 2007 18:49:06 +0300
From:	"Robert Iakobashvili" <coroberti@...il.com>
To:	"John Heffner" <jheffner@....edu>
Cc:	"David Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	greearb@...delatech.com
Subject: Re: TCP connection stops after high load.

Hi John,

On 4/15/07, John Heffner <jheffner@....edu> wrote:
> Robert Iakobashvili wrote:
> > Vanilla 2.6.18.3 works for me perfectly, whereas 2.6.19.5 and
> > 2.6.20.6 do not.
> >
> > Looking into the tcp /proc entries of 2.6.18.3 versus 2.6.19.5
> > tcp_rmem and tcp_wmem are the same, whereas tcp_mem are
> > much different:
> >
> > kernel                  tcp_mem
> > ---------------------------------------
> > 2.6.18.3    12288 16384 24576
> > 2.6.19.5      3072    4096   6144

> Another patch that went in right around that time:
>
> commit 52bf376c63eebe72e862a1a6e713976b038c3f50
> Author: John Heffner <jheffner@....edu>
> Date:   Tue Nov 14 20:25:17 2006 -0800
>
>      [TCP]: Fix up sysctl_tcp_mem initialization.
> (This has been changed again for 2.6.21.)
>
> In the dmesg, there should be some messages like this:
> IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
> TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
> TCP bind hash table entries: 65536 (order: 6, 262144 bytes)
> TCP: Hash tables configured (established 131072 bind 65536)
>
> What do yours say?

For the 2.6.19.5, where we have this problem:
>From dmsg:
IP route cache hash table entries: 4096 (order: 2, 16384 bytes)
TCP established hash table entries: 16384 (order: 5, 131072 bytes)
TCP bind hash table entries: 8192 (order: 4, 65536 bytes)

#cat /proc/sys/net/ipv4/tcp_mem
3072    4096    6144

MemTotal:       484368 kB
CONFIG_HIGHMEM4G=y

Thanks,

Sincerely,
Robert Iakobashvili,
coroberti %x40 gmail %x2e com
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