Re: Linux Raid performance

[Learner Study <learner.study@gmail.com>]

Hi Nicolae:

Can you please let me know:
- what HDDs (rpm etc.) of your system?
- which linux kernel are you using?

Thanks!

On Fri, Apr 2, 2010 at 2:58 AM, Nicolae Mihalache <mache@abcpages.com> wrote:
> I see some benchmarks performed at boot time on my Xeon E5410 2.33GHz
> that shows
> ...
> [   37.935702] raid6: sse2x1    3562 MB/s
> [   38.003702] raid6: sse2x2    6422 MB/s
> [   38.003702] raid6: using algorithm sse2x2 (6422 MB/s)
>
> This  speed is higher that the DDR2 667 theoretical speed of
> 5333MBs/sec. So I expect the limiting factor will never be the CPU, so
> it would not make sense to use multi-core.
>
> Am I completely off?
>
>
> nicolae
>
>
> Learner Study wrote:
>> Hi Keld:
>>
>> Do we have raid5/6 numbers for linux on any multi-core CPU? Most of
>> the benchmarks I have seen on wiki show raid5 perf to be ~150MB/s with
>> single core CPUs. How does that scale with multiple cores? Something
>> like intel's jasper forest???
>>
>> If available, can u pls point me to numbers with multi-core CPU?
>>
>> Thanks!
>>
>> On Wed, Mar 31, 2010 at 1:15 PM, Keld Simonsen <keld@keldix.com> wrote:
>>
>>> On Wed, Mar 31, 2010 at 12:42:57PM -0700, Learner Study wrote:
>>>
>>>> Hi Linux Raid Experts:
>>>>
>>>> I was looking at following wiki on raid perf on linux:
>>>>
>>>> https://raid.wiki.kernel.org/index.php/Performance
>>>>
>>>> and notice that the performance numbers are with 2.6.12 kernel.
>>>>
>>>> Do we perf numbers for:
>>>> - latest kernel (something like 2.6.27 / 2.6.31)
>>>> - raid 5 and 6
>>>>
>>>> Can someone please point me to appropriate link?
>>>>
>>> The link mentioned above has a number of other performance reports, for other levels of the kernel.
>>> Anyway you should be able to get comparable results for newer kernels, the kernel has not become
>>> slower since 2.6.12 on RAID.
>>>
>>> best regards
>>> Keld
>>>
>>>
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>
>
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