Re: Updated performance results

Steven Pratt
2009-09-23T15:24:42Z

Chris Mason wrote:
> On Thu, Sep 17, 2009 at 05:04:11PM -0500, Steven Pratt wrote:
>
>> Chris Mason wrote:
>>
>>> On Thu, Sep 17, 2009 at 04:17:14PM -0400, Chris Mason wrote:
>>>
>>>> [ crashes on runs involving unmounts ]
>>>>
>>>> The run is still going here, but it has survived longer than before.
>>>> I'm trying with Yan Zheng's patch:
>>>>
>>>> From: Yan Zheng <zheng.yan@oracle.com>
>>>> Date: Fri, 11 Sep 2009 16:11:19 -0400
>>>> Subject: [PATCH] Btrfs: improve async block group caching
>>>>
>>> Quick update, I got through a full run of Steve's test with this
>>> applied. I'll start a few more ;)
>>>
>> Seems to work for me too! Got through all the random write tests
>> with no problems. Will kick off full run overnight.
>>
>
> Thanks again.
>
> I've updated the btrfs-unstable tree to include Yan Zheng's fix. I've
> also included two more buffered writeback speedups, and I expect these
> to make a difference on the multi-threaded tests.
>
> I took a look at 1MB O_DIRECT writes, and the latencies of sending off
> checksumming to the checksum threads seem to be the biggest problem. I
> get full tput at 8MB O_DIRECT writes, so for now I'm going to leave this
> one alone.
>
Updated performance results are available. Ran both the 9/16 tree +
async patches and the tree from 9/18. Results are a mixed bag, some
faster some slower.

http://btrfs.boxacle.net/repository/raid/history/History.html

Steve

> -chris
>
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