From: Neil Brown <neilb@suse.de>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: Reading takes 100% precedence over writes for mdadm+raid5?
Date: Mon, 3 Dec 2007 10:18:52 +1100 [thread overview]
Message-ID: <18259.15708.870492.17273@notabene.brown> (raw)
In-Reply-To: message from Justin Piszcz on Sunday December 2
On Sunday December 2, jpiszcz@lucidpixels.com wrote:
>
> Was curious if when running 10 DD's (which are writing to the RAID 5)
> fine, no issues, suddenly all go into D-state and let the read/give it
> 100% priority?
So are you saying that the writes completely stalled while the read
was progressing? How exactly did you measure that?
What kernel version are you running.
>
> Is this normal?
It shouldn't be.
NeilBrown
next prev parent reply other threads:[~2007-12-02 23:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-02 23:09 Reading takes 100% precedence over writes for mdadm+raid5? Justin Piszcz
2007-12-02 23:18 ` Neil Brown [this message]
2007-12-02 23:26 ` Justin Piszcz
2007-12-06 1:27 ` Jon Nelson
2007-12-06 9:06 ` Justin Piszcz
2007-12-06 9:26 ` David Rees
2007-12-06 9:27 ` Justin Piszcz
2007-12-06 13:43 ` Jon Nelson
2007-12-06 16:11 ` Bill Davidsen
2007-12-09 0:13 ` Jon Nelson
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