Re: [PATCH 11/11] IB/srp: Prevent mapping failures

[Bart Van Assche <bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>]

On 05/05/2016 01:14 PM, Bart Van Assche wrote:
> On 05/05/2016 12:58 PM, Laurence Oberman wrote:
>> I added and tested this patch.
>> I left the warn message in as I need it.
>>
>> [root@srptest ~]# dmesg | grep Reducing
>> [  551.526015] scsi host4: ib_srp: Reducing max_sectors from 8192 to 4080
>> [  559.367609] scsi host5: ib_srp: Reducing max_sectors from 8192 to 4080
>> [  570.449121] scsi host5: ib_srp: Reducing max_sectors from 8192 to 4080
>> [  577.831703] scsi host6: ib_srp: Reducing max_sectors from 8192 to 4080
>>
>> Its stable but only because we constrain the max_sectors.
>> I am writing 4MB buffered to 10 file systems (ext3) however the max_sectors is constrained to 2040k and its stable.
>>
>> I have been told that RHEL6 and the Mofed stack happily does 4MB buffered I/O with mapping failures but I need to check that out.
>> That would make no sense to me unless the Mofed stack has code that differs enough to what we have upstream to make a difference.
>>
>> I am about to install RHEL6 and Mofed to compare and see what happens with 4MB buffered.
>>
>> Tested-by Laurence Oberman <loberman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>
> Thanks for the help with testing :-)
>
> Can you try to increase SRP_MAX_PAGES_PER_MR in ib_srp.h from 512 to
> 1024 and see whether that allows 4MB I/O?

(replying to my own e-mail)

That was a typo - I meant 1025 instead of 1024.

Bart.

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