From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Miquel van Smoorenburg <miquels@cistron.nl>,
Andrew Morton <akpm@osdl.org>
Cc: linux-mm@kvack.org
Subject: Re: Keeping mmap'ed files in core regression in 2.6.7-rc
Date: Tue, 15 Jun 2004 13:03:10 +1000 [thread overview]
Message-ID: <40CE66EE.8090903@yahoo.com.au> (raw)
In-Reply-To: <20040614140642.GE13422@traveler.cistron.net>
Miquel van Smoorenburg wrote:
> On 2004.06.12 08:56, Nick Piggin wrote:
>
>>Miquel van Smoorenburg wrote:
>>
>>
>>>Now I tried 2.6.7-rc2 and -rc3 (well rc2-bk-latest-before-rc3) and
>>>with those kernels, performance goes to hell because no matter
>>>how much I tune, the kernel will throw out the mmap'ed pages first.
>>>RSS of the innd process hovers around 200-250 MB instead of 600.
>>>
>>>Ideas ?
>>>
>>
>>Can you try the following patch please?
>
>
> The patch below indeed fixes this problem. Now most of the mmap'ed files
> are actually kept in memory and RSS is around 600 MB again:
>
OK good. Cc'ing Andrew.
> $ uname -a
> Linux quantum 2.6.7-rc3 #1 SMP Mon Jun 14 12:48:34 CEST 2004 i686 GNU/Linux
> $ free
> total used free shared buffers cached
> Mem: 1037240 897668 139572 0 159320 501688
> -/+ buffers/cache: 236660 800580
> Swap: 996020 16160 979860
> $ ps u -C innd
> USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
> news 277 31.8 56.2 857124 583896 ? D 13:02 57:01 /usr/local/news/b
>
> Hmm, weird that 'free' says that 139 MB is unused.. the box is doing
> lots of I/O. 'free' hovers between 30 - 250 MB over time.
>
> Look, 1 minute later:
>
> $ free
> total used free shared buffers cached
> Mem: 1037240 788368 248872 0 29260 497600
> -/+ buffers/cache: 261508 775732
> Swap: 996020 16260 979760
>
> Ah wait, that appears to be an outgoing feed process that keeps on allocating
> and freeing memory at a fast rate, so that makes sense I guess. At least
That would be right.
> the RSS of the main innd process remains steady at around ~600 MB and that
> is what is important for this application.
>
Absolute performance is the thing that matters at the end of the day.
Is it as good as 2.6.6 now?
Thanks
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next prev parent reply other threads:[~2004-06-15 3:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-08 14:29 Keeping mmap'ed files in core regression in 2.6.7-rc Miquel van Smoorenburg
2004-06-12 6:56 ` Nick Piggin
2004-06-14 14:06 ` Miquel van Smoorenburg
2004-06-15 3:03 ` Nick Piggin [this message]
2004-06-15 14:31 ` Miquel van Smoorenburg
2004-06-16 3:16 ` Nick Piggin
2004-06-16 3:50 ` Andrew Morton
2004-06-16 4:03 ` Nick Piggin
2004-06-16 4:23 ` Andrew Morton
2004-06-16 4:41 ` Nick Piggin
2004-06-17 10:50 ` Miquel van Smoorenburg
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