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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CANejiEX=-y6Kgtmfg1efqn_Ufdnn=Ls-4Nne3RYAWdt07+4o2A@mail.gmail.com>
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/