From: Nick Piggin <piggin@cyberone.com.au>
To: Mattias Wadenstein <maswan@acc.umu.se>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Performance issue with 2.6 md raid0
Date: Fri, 06 Feb 2004 13:17:48 +1100 [thread overview]
Message-ID: <4022F94C.30605@cyberone.com.au> (raw)
In-Reply-To: <Pine.A41.4.58.0402051647460.28218@lenin.acc.umu.se>
Mattias Wadenstein wrote:
>On Fri, 6 Feb 2004, Nick Piggin wrote:
>
>
>>Mattias Wadenstein wrote:
>>
>>
>>>Greetings.
>>>
>>>While testing a file server to store a couple of TB in resonably large
>>>files (>1G), I noticed an odd performance behaviour with the md raid0 in a
>>>pristine 2.6.2 kernel as compared to a 2.4.24 kernel.
>>>
>>>When striping two md raid5:s, instead of going from about 160-200MB/s for
>>>a single raid5 to 300M/s for the raid0 in 2.4.24, the 2.6.2 kernel gave
>>>135M/s in single stream read performance.
>>>
>>Can you try booting with elevator=deadline please?
>>
>
>Ok, then I get 253267 kB/s write and 153187 kB/s read from the raid0. A
>bit better, but still nowhere near the 2.4.24 numbers.
>
>For a single raid5, 158028 kB/s write and 162944 kB/s read.
>
>
Any idea what is holding back performance? Is it IO or CPU bound?
Can you get a profile of each kernel while doing a read please?
next prev parent reply other threads:[~2004-02-06 2:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-05 15:23 Performance issue with 2.6 md raid0 Mattias Wadenstein
2004-02-05 15:40 ` Nick Piggin
2004-02-05 16:03 ` Timothy Miller
2004-02-05 16:04 ` Mattias Wadenstein
2004-02-06 2:17 ` Nick Piggin [this message]
2004-02-06 2:34 ` Neil Brown
2004-02-06 14:54 ` Mattias Wadenstein
2004-02-06 19:33 ` Bill Davidsen
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