From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay2.corp.sgi.com [137.38.102.29]) by oss.sgi.com (Postfix) with ESMTP id CBB787F37 for ; Mon, 17 Jun 2013 06:13:59 -0500 (CDT) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by relay2.corp.sgi.com (Postfix) with ESMTP id B370D304032 for ; Mon, 17 Jun 2013 04:13:56 -0700 (PDT) Received: from ipmail05.adl6.internode.on.net (ipmail05.adl6.internode.on.net [150.101.137.143]) by cuda.sgi.com with ESMTP id EFxKGx2kWNCW7O0x for ; Mon, 17 Jun 2013 04:13:51 -0700 (PDT) Date: Mon, 17 Jun 2013 21:13:47 +1000 From: Dave Chinner Subject: Re: definitions for /proc/fs/xfs/stat Message-ID: <20130617111347.GL29338@dastard> References: <20130615020414.GB29338@dastard> <20130616001130.GE29338@dastard> <419435719.1662203.1371431489790.JavaMail.root@redhat.com> <20130617024603.GJ29338@dastard> <1597962722.1767244.1371447710942.JavaMail.root@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Mark Seger Cc: Nathan Scott , xfs@oss.sgi.com On Mon, Jun 17, 2013 at 06:57:14AM -0400, Mark Seger wrote: > all - good conversation and again, thanks for digging into this. The > comment about me running on an older kernel seems to be the problem and by > rerunning my test on precise/3.5.0-23-generic all seems to be operating > correctly, so I guess that was it. OK, good to know. > However, the one thing that does jump out of this is that proc/fs/xsfstats > and pcp were both showing many hundred MB/sec during tests that only ran > for a few seconds, which is impossible so it still feels some like sort of > accounting bug to me. On the other hand if the fact that this was an older > kernel, and newer kernels are fine, perhaps it's something just to note and > not worry about. How big is the write cache in your RAID array? If the log is the only thing being written to, and it fits within the cache, then it can easily push several hundred MB/s of write IO.... Cheers, Dave. -- Dave Chinner david@fromorbit.com _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs