From: Andras Korn <korn@raidlist.elan.rulez.org>
To: linux-raid@vger.kernel.org
Subject: Re: write-behind has no measurable effect?
Date: Tue, 15 Feb 2011 13:40:26 +0100 [thread overview]
Message-ID: <20110215124026.GC13135@hellgate.intra.guy> (raw)
In-Reply-To: <AANLkTinAV4jJc8ueZ1mjRPpDnA_eWhUDcL8uz-0Ufifk@mail.gmail.com>
On Tue, Feb 15, 2011 at 06:10:17AM -0300, Roberto Spadim wrote:
> andras could you make some benchmarks to raid1 with round robin read balance?
> at this site:
> www.spadim.com.br/raid1/
>
> it's kernel 2.6.37 based
Yes, I can do that. Can you give me some hints on what specific
configuration to try? I see you have some sysfs tunables. My raid1 array
consists of two spinning disks and an SSD, all local.
Do you expect this patch to make a difference in my case? With the spinning
disks marked as write-mostly, I'm getting close to the read performance of
the SSD (except for very small random reads, for some reason).
It's random writes that are much slower than with only the SSD.
--
Andras Korn <korn at elan.rulez.org>
There is no spoon(). But there is a fork().
next prev parent reply other threads:[~2011-02-15 12:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-14 21:38 write-behind has no measurable effect? Andras Korn
2011-02-14 22:50 ` NeilBrown
2011-02-14 22:57 ` Andras Korn
2011-02-14 23:41 ` NeilBrown
2011-02-15 1:00 ` Andras Korn
2011-02-15 1:19 ` John Robinson
2011-02-15 2:19 ` Andras Korn
[not found] ` <AANLkTikFSOePZJXknAt=Tx6+FpdJ4tiSNwpuwuPC3RY=@mail.gmail.com>
2011-02-15 9:10 ` Roberto Spadim
2011-02-15 12:40 ` Andras Korn [this message]
2011-02-15 13:26 ` Roberto Spadim
2011-02-15 17:46 ` Roberto Spadim
2011-02-16 12:00 ` Andras Korn
2011-02-16 15:00 ` Roberto Spadim
2011-02-14 22:56 ` Doug Dumitru
2011-02-14 23:03 ` Andras Korn
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