From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Ben Greear <greearb@candelatech.com>
Cc: Christian Schmid <webmaster@rapidforum.com>,
linux-kernel@vger.kernel.org
Subject: Re: BUG: Slowdown on 3000 socket-machines tracked down
Date: Mon, 07 Mar 2005 16:14:37 +1100 [thread overview]
Message-ID: <422BE33D.5080904@yahoo.com.au> (raw)
In-Reply-To: <422BC303.9060907@candelatech.com>
Ben Greear wrote:
> Christian Schmid wrote:
>
>> Ben Greear wrote:
>>> How many bytes are you sending with each call to write()/sendto()
>>> whatever?
>>
>>
>> I am using sendfile-call every 100 ms per socket with the poll-api. So
>> basically around 40 kb per round.
>
>
> My application is single-threaded, uses non-blocking IO, and sends/rcvs
> from/to memory.
> It will be a good test of the TCP stack, but will not use the sendfile
> logic,
> nor will it touch the HD.
>
I think you would have better luck in reproducing this problem if you
did the full sendfile thing.
I think it is becoming disk bound due to page reclaim problems, which
is causing the slowdown.
In that case, writing the network only test would help to confirm the
problem is not a networking one - so not useless by any means.
next prev parent reply other threads:[~2005-03-07 5:14 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-05 17:10 BUG: Slowdown on 3000 socket-machines tracked down Christian Schmid
2005-03-07 0:45 ` Nick Piggin
2005-03-07 1:13 ` Ben Greear
2005-03-07 1:58 ` Christian Schmid
2005-03-07 2:57 ` Ben Greear
2005-03-07 5:14 ` Nick Piggin [this message]
2005-03-07 5:30 ` Willy Tarreau
2005-03-07 5:41 ` Nick Piggin
2005-03-07 5:42 ` Nick Piggin
2005-03-07 5:46 ` Willy Tarreau
2005-03-07 9:22 ` Ben Greear
2005-03-07 9:28 ` Nick Piggin
2005-03-08 6:30 ` Ben Greear
2005-03-08 16:41 ` Christian Schmid
2005-03-09 23:45 ` Ben Greear
2005-03-09 23:52 ` Christian Schmid
2005-03-10 0:18 ` Ben Greear
2005-03-10 0:24 ` Christian Schmid
2005-03-10 5:17 ` Andrew Morton
2005-03-10 9:00 ` Andi Kleen
2005-03-10 9:09 ` Andrew Morton
2005-03-10 9:12 ` Andi Kleen
2005-03-10 9:38 ` Andrew Morton
2005-03-10 19:03 ` Ben Greear
2005-03-10 18:51 ` Christian Schmid
2005-03-10 19:06 ` Christian Schmid
2005-03-11 15:29 ` Christian Schmid
2005-03-11 19:10 ` Ben Greear
2005-03-11 19:27 ` Christian Schmid
2005-03-14 4:40 ` Nick Piggin
2005-03-14 4:53 ` Christian Schmid
2005-03-14 5:04 ` Nick Piggin
2005-05-28 3:17 ` Christian Schmid
2005-06-08 2:26 ` Christian Schmid
2005-06-08 2:39 ` Nick Piggin
2005-06-08 2:44 ` Andrew Morton
2005-03-07 14:35 ` Christian Schmid
2005-03-07 23:37 ` Ben Greear
2005-03-07 2:07 ` Christian Schmid
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