linux-kernel - Re: [patch 0/7] Add TRIM support for raid linear/0/1/10

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Date:	Thu, 15 Mar 2012 10:39:44 +0800
From:	Shaohua Li <shli@...nel.org>
To:	Holger Kiehl <Holger.Kiehl@....de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"neilb@...e.de" <neilb@...e.de>,
	"axboe@...nel.dk" <axboe@...nel.dk>
Subject: Re: [patch 0/7] Add TRIM support for raid linear/0/1/10

2012/3/15 Holger Kiehl <Holger.Kiehl@....de>:
> On Wed, 14 Mar 2012, Shaohua Li wrote:
>
>> Maybe the discard runs slow with small size request in the disk.
>> please drop patch "blk: add plug for blkdev_issue_discard" and try again.
>> Since
>> we can't do merge, the plug just introduces latency.
>>
> Tried again without the patch applied, but there is only a very small
> performance increase (520->600 agains 4000 fps without discard).
>
> The benchmark creates lots of small files (2 KiB) and deletes them again.
>
>
>> if it doesn't help, please capture a blktrace when you do the benchmark
>> and
>> send it to me.
>>
> Ok, I will do this tomorrow. Need some sleep :-)
>
> Thanks for your work on supporting discard in MD!
I tried your benchmark, create 2000k 2k files and delete them and
follows a sync.
the discard runs pretty fast for both raid 0/1. So can't reproduce the
issue. I'm using
a fusionio card though. I'm afraid nothing I can do till get you blktrace.

Thanks,
Shaohua
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