Re: Software RAID checksum performance on 24 disks not even close to kernel reported

[Igor M Podlesny <for.poige+lsr@xxxxxxxxx>]

On 5 June 2012 15:47, Ole Tange <ole@xxxxxxxx> wrote:
> On Tue, Jun 5, 2012 at 5:39 AM, Igor M Podlesny <for.poige+lsr@xxxxxxxxx> wrote:
>> On 5 June 2012 07:14, Ole Tange <ole@xxxxxxxx> wrote:
>> […]
>>> I tested this by creating 24 devices in RAM, used different chunk
>>> sizes, and then copied the linux kernel source. Test script can be
>>> found on http://oletange.blogspot.dk/2012/05/software-raid-performance-on-24-disks.html
>>
>>   I don't see there "--assume-clean" option, and it's (again) not
>> clear — are you playing with re-syncing RAID or what?
>
> Good call. But the resync is done before the mkfs.xfs is finished, so
> the time of the copying is not affected by resync.
>
> I re-tested with --assume-clean and as expected it has no impact.

   Wanna try CONFIG_MULTICORE_RAID456? :-)

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