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SubjectRe: Kernel 3.0: Instant kernel crash when mounting CIFS (also crashes with linux-3.1-rc2


On Thu, 18 Aug 2011, Justin Piszcz wrote:

>
>
> On Thu, 18 Aug 2011, Justin Piszcz wrote:
>
>>
>>
>> On Thu, 18 Aug 2011, J. R. Okajima wrote:
>>
>>>
>>> Justin Piszcz:
>>>> Does anyone know if any kernel supports CIFS w/out crashing? I'd like to
>>>> backup some CIFS shares, thanks.
>>>>
>>>>
>>>> mount -t cifs //w2/x /mnt -o user=user,pass=pass
>>>>
>>>> [ 881.388836] CIFS VFS: cifs_mount failed w/return code = -22
>>> :::
>>>
>>> Since it failed mounting, this patch will help you. Although the patch
>>> will fix one bug, there still may exist another problem.
>>>
>>> http://marc.info/?l=linux-cifs&m=131345112022031&w=2
>>
>> Hi,
>>
>> Latest patch (this one) applied to linux-3.1-rc2 works, at least it mounted
>> this time and did not instantly crash the kernel!
>>
>> I also tried the hostname again (and it did not crash the kernel, but it
>> failed to mount).
>>
>> Used the IP and it mounted successfully:
>> //10.0.0.11/x 28T 5.0T 23T 19% /mnt
>> //10.0.0.11/y 19T 1.2T 18T 7% /mnt2
>>
>> It has not crashed yet (which is good), I'll apply this patch to my
>> production machine and test taking backups of this data and let you know
>> if it crashes again, thanks!
>>
>> Justin.
>
>
> Hello,
>
> It is working but very slowly:
>
> Device eth6 [10.0.1.2] (1/1):
> ================================================================================
> Incoming: Outgoing:
> Curr: 37.60 MByte/s Curr: 0.44 MByte/s
> Avg: 4.98 MByte/s Avg: 0.09 MByte/s
> Min: 0.00 MByte/s Min: 0.00 MByte/s
> Max: 40.79 MByte/s Max: 0.48 MByte/s
> Ttl: 1.45 GByte Ttl: 26.77 MByte
>
> Over 10GbE the other direction (Linux -> Windows (via Samba)) I get 500MiB/s,
> is CIFS slow?
>
> I'll look into options to tweak the speed but this is very poor speed when
> you have to transfer 5-10TB. However, it is not crashing anymore, so any
> speed is better than that :)
>
> Justin.

Hi,

Mounting with:
rw,uid=1000,gid=100,mode=0644,rsize=130048,wsize=1048576,credentials=/root/.cifs
Same speed:
Device eth6 [10.0.1.2] (1/1):
================================================================================
Incoming: Outgoing:
Curr: 32.42 MByte/s Curr: 0.38 MByte/s
Avg: 30.72 MByte/s Avg: 0.39 MByte/s
Min: 0.00 MByte/s Min: 0.00 MByte/s
Max: 43.64 MByte/s Max: 0.59 MByte/s
Ttl: 20.15 GByte Ttl: 261.03 MByte

Thoughts?

Has anyone achieved > 30-40MB/s with CIFS?
This is a 10GbE link (and yes JUMBO frames are enabled on both sides, and
again, samba from Linux->Windows = 500MB/s)

Justin.



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