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Re: [PATCH] xfs: Do background CIL flushes via a workqueue

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH] xfs: Do background CIL flushes via a workqueue
From: Vivek Goyal <vgoyal@xxxxxxxxxx>
Date: Tue, 27 Mar 2012 13:18:45 -0400
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20120327170309.GA6712@xxxxxxxxxxxxx>
References: <1332841605-3538-1-git-send-email-david@xxxxxxxxxxxxx> <20120327143127.GA11434@xxxxxxxxxxxxx> <20120327155759.GB28707@xxxxxxxxxx> <20120327160300.GA22555@xxxxxxxxxxxxx> <20120327161941.GC28707@xxxxxxxxxx> <20120327170309.GA6712@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Mar 27, 2012 at 01:03:09PM -0400, Christoph Hellwig wrote:
> On Tue, Mar 27, 2012 at 12:19:41PM -0400, Vivek Goyal wrote:
> > So xfs either need to resort to similar optimizaiton where IO type from
> > both the process context is of same type or try to do all the IO from
> > one process context. 
> 
> All XFS log I/O is marked SYNC and (FUA and/or FLUSH).

In that case I am not sure if XFS should still face the idling issue. If
it does, then we need to debug it further and see why the fix is not
working.

Dave, any chance of 10 seconds of blktrace data when this problem happens?

Thanks
Vivek

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