linux-kernel - Re: [KORG] Re: kernel.org lies about latest -mm kernel

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Date:	Sat, 06 Jan 2007 15:50:41 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Morton <akpm@...l.org>
CC:	Nicholas Miell <nmiell@...cast.net>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	"J.H." <warthog9@...nel.org>, Willy Tarreau <w@....eu>,
	Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	webmaster@...nel.org
Subject: Re: [KORG] Re: kernel.org lies about latest -mm kernel

Andrew Morton wrote:
>>>
>>> The most fundamental problem seems to be that I can't tell currnt Linux 
>>> kernels that the dcache/icache is precious, and that it's way too eager 
>>> to dump dcache and icache in favour of data blocks.  If I could do that, 
>>> this problem would be much, much smaller.
> 
> Usually people complain about the exact opposite of this.
> 
>> Isn't setting the vm.vfs_cache_pressure sysctl below 100 supposed to do
>> this?
> 
> yup.

Well, it appears that even a setting of 1 is too aggressive for 
kernel.org.  We're still ending up with each and every getdents() call 
taking anywhere from 200 ms to over a second.

	-hpa
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