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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "Martin J. Bligh" <mbligh@aracnet.com>,
	mingo@elte.hu, kernel@kolivas.org, linux-kernel@vger.kernel.org,
	piggin@cyberone.com.au, akpm@osdl.org, wli@holomorphy.com,
	torvalds@osdl.org, markw@osdl.org
Subject: Re: [PATCH] Performance regression in 2.6.7-rc3
Date: Wed, 16 Jun 2004 13:05:33 +1000	[thread overview]
Message-ID: <40CFB8FD.2010601@yahoo.com.au> (raw)
In-Reply-To: <E1BaPwX-0007k0-00@gondolin.me.apana.org.au>

Herbert Xu wrote:
> Martin J. Bligh <mbligh@aracnet.com> wrote:
> 
>>How the hell can that have any effect on non-threaded workloads? Perhaps
>>some part of kernel compile *is* multi-threaded. It does seem to get 
> 
> 
> make(1) with vfork(2) perhaps?

I think balance on clone probably needs to be turned off by default
presently.

It slows down a simple thread creation test by a factor of 7(!) here,
and has quite a few not too difficult to imagine performance problems.


  reply	other threads:[~2004-06-16  3:08 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-06-12  0:28 [PATCH] Performance regression in 2.6.7-rc3 Con Kolivas
2004-06-12  7:58 ` Nick Piggin
2004-06-15  4:56 ` Ingo Molnar
2004-06-15 13:11   ` Con Kolivas
2004-06-15 15:02   ` Martin J. Bligh
2004-06-16  2:14     ` Herbert Xu
2004-06-16  3:05       ` Nick Piggin [this message]
2004-06-16  3:10         ` Linus Torvalds
2004-06-16  3:18           ` Nick Piggin
2004-06-16  7:02           ` Ingo Molnar
2004-06-16  3:09       ` Linus Torvalds
2004-06-16 14:54         ` Martin J. Bligh
2004-06-16  3:00   ` Nick Piggin
2004-06-16  1:22     ` Con Kolivas

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