linux-kernel - Re: CFQ: async queue blocks the whole system

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]

Date:	Fri, 10 Jun 2011 05:17:47 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	Tao Ma <tm@....ma>, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: CFQ: async queue blocks the whole system

On Fri, Jun 10, 2011 at 09:19:12AM +0800, Shaohua Li wrote:

[..]
> > If there is no major advantage of draining sync requests before async
> > is dispatched, I think this should be an easy fix.
> I thought this is to avoid sync latency if we switch from an async
> queue to sync queue later.

Is it about the sync request latency which has already been dispatched? I 
really wish that driver and disk should do some prioritazation for reads
here and CFQ does not have to jump through hoops like drain sync requests
before async requests are dispatched.

Thanks
Vivek
--
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/