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

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Message-ID: <alpine.LRH.2.02.1203142101290.6232@diagnostix.dwd.de>
Date:	Wed, 14 Mar 2012 21:13:02 +0000 (GMT)
From:	Holger Kiehl <Holger.Kiehl@....de>
To:	Shaohua Li <shli@...nel.org>
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

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!

Regards,
Holger
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