Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261446AbVCOQYy (ORCPT ); Tue, 15 Mar 2005 11:24:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261388AbVCOQXM (ORCPT ); Tue, 15 Mar 2005 11:23:12 -0500 Received: from e35.co.us.ibm.com ([32.97.110.133]:12768 "EHLO e35.co.us.ibm.com") by vger.kernel.org with ESMTP id S261403AbVCOQWF (ORCPT ); Tue, 15 Mar 2005 11:22:05 -0500 Subject: Re: [Ext2-devel] Re: inode cache, dentry cache, buffer heads usage From: Badari Pulavarty To: Andrew Morton Cc: ext2-devel , Linux Kernel Mailing List In-Reply-To: <20050314144103.0d6ed063.akpm@osdl.org> References: <1110394558.24286.203.camel@dyn318077bld.beaverton.ibm.com> <20050310174751.522c5420.akpm@osdl.org> <1110835692.24286.288.camel@dyn318077bld.beaverton.ibm.com> <20050314141128.7da95c34.akpm@osdl.org> <1110838395.24286.297.camel@dyn318077bld.beaverton.ibm.com> <20050314144103.0d6ed063.akpm@osdl.org> Content-Type: text/plain Organization: Message-Id: <1110903430.24286.336.camel@dyn318077bld.beaverton.ibm.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.2 (1.2.2-5) Date: 15 Mar 2005 08:17:11 -0800 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1780 Lines: 53 On Mon, 2005-03-14 at 14:41, Andrew Morton wrote: > Badari Pulavarty wrote: > > > > On Mon, 2005-03-14 at 14:11, Andrew Morton wrote: > > > Badari Pulavarty wrote: > > > > > > > > On Thu, 2005-03-10 at 17:47, Andrew Morton wrote: > > > > > Badari Pulavarty wrote: > > > > > > > > > > > > So, why is these slab cache are not getting purged/shrinked even > > > > > > under memory pressure ? (I have seen lowmem as low as 6MB). What > > > > > > can I do to keep the machine healthy ? > > > > > > > > > > Tried increasing /proc/sys/vm/vfs_cache_pressure? (That might not be in > > > > > 2.6.8 though). > > > > > > > > > > > > > > > > > > Yep. This helped shrink the slabs, but we end up eating up lots of > > > > the lowmem in Buffers. Is there a way to shrink buffers ? > > > > > > It would require some patchwork. Why is it a problem? That memory is > > > reclaimable. > > > > > > > Well, machine pauses for 5-30 seconds for each vi,cscope, write() etc. > > Why? Dunno. Trying to figure out whats happening here. Lowmem pressure was the top on our list - but nothing to prove it - yet. > > > > How'd you get 1.8gig of lowmem? > > > > 2:2 split > > > > Does a normal kernel exhibit the pauses? We haven't tried 3:1 split on this machine for a while. This machine starts to slow down over the time. (It is up for last 70 days). We are trying to collect all the info and also try everything possible to understand issues - before we reboot. Thanks, Badari - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/