[Users] openvz IO bench

[Kirill Korotaev]

disk performance is very hard to benchmark in a fair manner since it very
much depends on where physical blocks are allocated by a file system.
FYI, disk speed can vary 2x times at beginning and end of partition.

Thanks,
Kirill



On 8/31/08 2:31 PM, "Zhaohui Wang" <zwange at gmu.edu> wrote:

>
>
>
> Hi all
>
> Have you ever tried benchmark the IO overhead in openvz? I did 2 set of test,
> one is 20 times wget a 7.4 file from a remote websever in a network link
> without interference of other links; the other is cp the 7.4g file for 10
> times. The wget test showed 4% IO overhead in openvz 2.6.24 kernel comparing
> to vanilla,while the cp test showed a  -7% overhead.
>
> How come cp operation is more faster in openvz kernel than vanilla kernel?Any
> expert can offer a explaination?
>
> Many thanks.
>
>
> Best Regards
> Zhaohui Wang
>
>
>> -----Original Message-----
>> From: users-bounces at openvz.org [mailto:users-bounces at openvz.org] On
>> Behalf Of Adeel Nazir
>> Sent: Saturday, August 30, 2008 5:34 PM
>> To: users at openvz.org; devel at openvz.org
>> Subject: [Users] OpenVZ & Linux-rt
>>
>> Has anyone tried mixing Ingo Milnar's real-time patchset with the
>> OpenVZ patches? Or if anyone has any ideas if there'd be conflicting
>> issues between the 2 patchset's? I tried trivially applying the patches
>> from both projects and there were a lot of places where the patching
>> failed, requiring a manual review, leading me to ask for some details
>> on what the openvz patchset really changes from the stock kernel?
>>
>> Thanks
>>
>>
>> Adeel
>>
>>
>>
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>
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