A problem of cifs performance

A problem of cifs performance

[周伟杰]

Dear Sir:

  Situation：
  I create a share folder on windows 7,then I mount it via Linux.
  I copy a file from the folder to Linux,but the max read rate is
28MB/s and the write rate can be 110MB/s .
  I try to mount cifs by changing rsize ,but it can't be faster.
  I don't know why the read rate is unusual?

  Environment：
  1.RHEL 6.2：2.6.32-220.el6.x86_64
  2.CIFS version：1.68
  3.mount.cifs version：4.8.1

Sincerely

Re: A problem of cifs performance

[Jeff Layton]

On Sat, 27 Jul 2013 09:57:46 +0800
周伟杰 <zhou.weijie-9ato6ouKlQJBDgjK7y7TUQ@public.gmane.org> wrote:

> Dear Sir:
> 
>   Situation：
>   I create a share folder on windows 7,then I mount it via Linux.
>   I copy a file from the folder to Linux,but the max read rate is
> 28MB/s and the write rate can be 110MB/s .
>   I try to mount cifs by changing rsize ,but it can't be faster.
>   I don't know why the read rate is unusual?
> 
>   Environment：
>   1.RHEL 6.2：2.6.32-220.el6.x86_64
>   2.CIFS version：1.68
>   3.mount.cifs version：4.8.1
> 

That kernel has a patchset that adds some asynchronous write
capability, but does not yet have the patches that add asynchronous
(and larger) read capability. I know that Sachin has backported those
for RHEL6.5. When that kernel is released (another several months or
so?), read performance should substantially improve.

-- 
Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Re: A problem of cifs performance

[周伟杰]

Thank you for your points.I will try.

2013/7/27 Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>:
> On Sat, 27 Jul 2013 09:57:46 +0800
> 周伟杰 <zhou.weijie-9ato6ouKlQJBDgjK7y7TUQ@public.gmane.org> wrote:
>
>> Dear Sir:
>>
>>   Situation：
>>   I create a share folder on windows 7,then I mount it via Linux.
>>   I copy a file from the folder to Linux,but the max read rate is
>> 28MB/s and the write rate can be 110MB/s .
>>   I try to mount cifs by changing rsize ,but it can't be faster.
>>   I don't know why the read rate is unusual?
>>
>>   Environment：
>>   1.RHEL 6.2：2.6.32-220.el6.x86_64
>>   2.CIFS version：1.68
>>   3.mount.cifs version：4.8.1
>>
>
> That kernel has a patchset that adds some asynchronous write
> capability, but does not yet have the patches that add asynchronous
> (and larger) read capability. I know that Sachin has backported those
> for RHEL6.5. When that kernel is released (another several months or
> so?), read performance should substantially improve.
>
> --
> Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>