[Top] [All Lists]

Re: gentoo linux, kernel 3.10.31 mount options bug?

To: Xfs <xfs@xxxxxxxxxxx>
Subject: Re: gentoo linux, kernel 3.10.31 mount options bug?
From: Marko Weber|8000 <weber@xxxxxxxxxx>
Date: Tue, 25 Feb 2014 09:10:35 +0100
Delivered-to: xfs@xxxxxxxxxxx
Dkim-filter: OpenDKIM Filter v2.8.4 mail.zbfmail.de 83F7010C147
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zbfmail.de; s=dkim; t=1393315838; bh=36MAymhsJwNxgMlrHBSLivow1YeFJtr4+oa9HOCwu3M=; h=In-Reply-To:References:Subject:From:Date:To; b=GpdYTkAY/V0kEPs5nmGlaHbyGw9cbfyGZtBWO/RNOLsEY/mBnI7D5Qyd2/3jAIUy9 sHQ3vc0U6YkKU1wNDcg2lZGWwecxiepXCxq87bLK0fXfwB6SVwGpzHUW+iWdgLGlSr VPWGZJ7BGAii1QbiNb2Sw8QPY3T3b+gngoTjZwLA=
In-reply-to: <530A71E3.9060107@xxxxxxxxxxxxxxxxx>
References: <9963a76fbd006355c9ffd79f341c9971@xxxxxxxxxx> <530A71E3.9060107@xxxxxxxxxxxxxxxxx>
User-agent: K-9 Mail for Android
Thanks for the short and clear answer stan.


On 23. Februar 2014 23:10:43 MEZ, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> wrote:
On 2/23/2014 3:37 AM, Marko Weber|8000 wrote:
linux /bzImage-3.10.31 root=/dev/md2 elevator=cfq clocksource=hpet

cfq tends to defeat much of the parallelism in XFS, decreasing
throughput substantially. This is documented in the XFS FAQ and has
been discussed here many times in the past. It has been recommended for
a few years now that XFS not be used with the cfq elevator. Use
deadline with md arrays on plain HBAs and noop on SSDs or any device
with [F|B]BWC, i.e. RAID HBA or SAN controller.

If you're using cfq to allow shaping of per process IO with control
groups, simply using cfq alone may slow down XFS throughput to the point
that you don't need to bother with control group optimizations.

Diese Nachricht wurde von meinem Android-Mobiltelefon mit K-9 Mail gesendet.
<Prev in Thread] Current Thread [Next in Thread>