From: Bill Davidsen <davidsen@tmr.com>
To: Neil Brown <neilb@suse.de>
Cc: Dan Williams <dan.j.williams@gmail.com>,
Roger Lucas <roger@planbit.co.uk>,
linux-raid@vger.kernel.org
Subject: Re: Odd (slow) RAID performance
Date: Sat, 09 Dec 2006 15:20:18 -0500 [thread overview]
Message-ID: <457B1A82.6070105@tmr.com> (raw)
In-Reply-To: <17785.5135.749830.180388@cse.unsw.edu.au>
Neil Brown wrote:
> On Friday December 8, neilb@suse.de wrote:
>
>> I have measured very slow write throughput for raid5 as well, though
>> 2.6.18 does seem to have the same problem. I'll double check and do a
>> git bisect and see what I can come up with.
>>
>
> Correction... it isn't 2.6.18 that fixes the problem. It is compiling
> without LOCKDEP or PROVE_LOCKING. I remove those and suddenly a
> 3 drive raid5 is faster than a single drive rather than much slower.
>
> Bill: Do you have LOCKDEP or PROVE_LOCKING enabled in your .config ??
>
I have to check tomorrow, I'm using the Fedora kernel (as noted in the
first post on this) rather than one I built, just so others could verify
my results as several have been kind enough to do. Have to run, but I
will check tomorrow or Monday morning early at the latest.
--
bill davidsen <davidsen@tmr.com>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
next prev parent reply other threads:[~2006-12-09 20:20 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-30 14:13 Odd (slow) RAID performance Bill Davidsen
2006-11-30 14:31 ` Roger Lucas
2006-11-30 15:30 ` Bill Davidsen
2006-11-30 15:32 ` Roger Lucas
2006-11-30 21:09 ` Bill Davidsen
2006-12-01 9:24 ` Roger Lucas
2006-12-02 5:27 ` Bill Davidsen
2006-12-05 1:33 ` Dan Williams
2006-12-07 15:51 ` Bill Davidsen
2006-12-08 1:15 ` Corey Hickey
2006-12-08 8:21 ` Gabor Gombas
2006-12-08 6:01 ` Neil Brown
2006-12-08 7:28 ` Neil Brown
2006-12-09 20:20 ` Bill Davidsen [this message]
2006-12-12 17:44 ` Bill Davidsen
2006-12-12 18:48 ` Raz Ben-Jehuda(caro)
2006-12-12 21:51 ` Bill Davidsen
2006-12-13 17:44 ` Mark Hahn
2006-12-20 4:05 ` Bill Davidsen
2006-12-09 20:16 ` Bill Davidsen
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