From: Christian Schmid <webmaster@rapidforum.com>
To: Ben Greear <greearb@candelatech.com>
Cc: Andrew Morton <akpm@osdl.org>,
nickpiggin@yahoo.com.au, linux-kernel@vger.kernel.org
Subject: Re: BUG: Slowdown on 3000 socket-machines tracked down
Date: Fri, 11 Mar 2005 20:27:14 +0100 [thread overview]
Message-ID: <4231F112.60403@rapidforum.com> (raw)
In-Reply-To: <4231ED18.2050804@candelatech.com>
Ben Greear wrote:
> Christian Schmid wrote:
>
>> OHGAWD I GOT IT!!!!!!!!
>>
>> I admit, totally coincidentially but its really FIXED. Today I went to
>> the puter scanning the servers by routine and wondered why the
>> bandwidth is at 100% without any holes.
>>
>> The only thing I have done is I switched off hyper-threading because
>> the server is at only 20% CPU anyway so I just disabled it.
>>
>> So its something with linux dealing with hyper-threading. YAY :)
>
>
> For what it's worth, I was running dual-xeon systems with HT turned on.
>
> But, I have a single process, single-threaded application, so there is
> not much
> scheduling to be done. If you have a large number of threads or processes,
> then it would make more sense for turning off HT to have an affect.
This effect appeared on 1 task and on 200 tasks. I dont know what it is, but with HT off it doesnt
appear anymore. The slow-down still appears when lower_zone_protection is set to 0 but the peak at
80 MB disappeared when set to 1024. I am now running at 95 MB/Sec smoothly.
Chris
next prev parent reply other threads:[~2005-03-11 19:31 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
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 [this message]
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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