Message-ID: <45A035D1.6070701@zytor.com>
Date: Sat, 06 Jan 2007 15:50:41 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Andrew Morton <akpm@osdl.org>
CC: Nicholas Miell <nmiell@comcast.net>,
       Randy Dunlap <randy.dunlap@oracle.com>, "J.H." <warthog9@kernel.org>,
       Willy Tarreau <w@1wt.eu>, Pavel Machek <pavel@ucw.cz>,
       kernel list <linux-kernel@vger.kernel.org>, webmaster@kernel.org
Subject: Re: [KORG] Re: kernel.org lies about latest -mm kernel
References: <20061214223718.GA3816@elf.ucw.cz>	<20061216094421.416a271e.randy.dunlap@oracle.com>	<20061216095702.3e6f1d1f.akpm@osdl.org>	<458434B0.4090506@oracle.com>	<1166297434.26330.34.camel@localhost.localdomain>	<20061219063413.GI24090@1wt.eu>	<1166511171.26330.120.camel@localhost.localdomain>	<20070106103331.48150aed.randy.dunlap@oracle.com>	<459FF60D.7080901@zytor.com>	<1168112266.2821.2.camel@entropy> <20070106121301.d07de0c9.akpm@osdl.org>
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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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