linux-kernel - Re: [PATCH]cfq-iosched: give busy sync queue no dispatch limit

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 for Android: free password hash cracker in your pocket

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

Message-ID: <4D7496C5.6010900@fusionio.com>
Date:	Mon, 7 Mar 2011 09:26:45 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Shaohua Li <shaohua.li@...el.com>
CC:	lkml <linux-kernel@...r.kernel.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>
Subject: Re: [PATCH]cfq-iosched: give busy sync queue no dispatch limit

On 2011-03-04 09:01, Shaohua Li wrote:
> If there are a sync and an async queue and the sync queue's think time is small,
> we can ignore the sync queue's dispatch quantum. Because the sync queue will
> always preempt the async queue, we don't need to care about async's latency.
> This can fix a performance regression of aiostress test, which is introduced by
> commit f8ae6e3eb825. The issue should exist even without the commit, but the
> commit amplifies the impact.
> 
> The initial post does the same optimization for RT queue too, but since I have
> no real workload for it, Vivek suggests to drop it.

Thanks, applied.

-- 
Jens Axboe

--
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/