linux-kernel - Re: [PATCH 1/1] NBD: make nbd default to deadline I/O scheduler

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: <20080208101151.935b575c.akpm@linux-foundation.org>
Date:	Fri, 8 Feb 2008 10:11:51 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Paul Clements <paul.clements@...eleye.com>,
	linux-kernel@...r.kernel.org, nbd-general@...ts.sourceforge.net,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH 1/1] NBD: make nbd default to deadline I/O scheduler

On Fri, 8 Feb 2008 09:33:41 -0800 Randy Dunlap <randy.dunlap@...cle.com> wrote:

> On Fri, 08 Feb 2008 11:47:42 -0500 Paul Clements wrote:
> 
> > There have been numerous reports of problems with nbd and cfq. Deadline 
> > gives better performance for nbd, anyway, so let's use it by default.

Please define "problems".  If it's just "slowness" then we can live with
that, but I'd hope that Jens is aware and that it's understood.

It it's "hangs" or "oopses" then we panic.

> so what happens with this patch on cfq-only or as-only kernels?

I assume the elevator_init() call fails and the default elevator continues
to be used.  Perhaps an informative printk is needed.

--
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/