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Re: [PATCH] xfs: force background CIL push under sustained load

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH] xfs: force background CIL push under sustained load
From: Alex Elder <aelder@xxxxxxx>
Date: Thu, 23 Sep 2010 13:58:32 -0500
Cc: xfs@xxxxxxxxxxx
In-reply-to: <1285208863-31489-1-git-send-email-david@xxxxxxxxxxxxx>
References: <1285208863-31489-1-git-send-email-david@xxxxxxxxxxxxx>
Reply-to: aelder@xxxxxxx
On Thu, 2010-09-23 at 12:27 +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> I have been seeing relatively frequent pauses in transaction throughput up to
> 30s long under heavy parallel workloads. The only thing that seemed strange
> about them was that the xfsaild was active during the pauses, but making no
> progress. It was running exactly 20 times a second (on the 50ms no-progress
> backoff), and the number of pushbuf events was constant across this time as
> well.  IOWs, the xfsaild appeared to be stuck on buffers that it could not 
> push
> out.

. . .

If you like I can take this patch directly (i.e., not wait for you to
send a separate pull request).  It fixes a real bug but since delayed
logging still an experimental feature I am not inclined to send it to
Linus at this point in the cycle.  Let me know if you disagree.

                                        -Alex

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