Re: Performance drop due to "blk-mq-sched: improve sequential I/O performance"

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On Wed, May 2, 2018 at 6:39 PM, Kashyap Desai
<kashyap.desai@xxxxxxxxxxxx> wrote:
>> > I have created internal code changes based on below RFC and using irq
>> > poll CPU lockup issue is resolved.
>> > https://www.spinics.net/lists/linux-scsi/msg116668.html
>>
>> Could we use the 1:1 mapping and not apply out-of-tree irq poll in the
>> following test? So that we can keep at same page easily.
>
> Above RFC changes are not used in my testing.  I used same inbox driver
> from 4.17-rc.

Sorry for being late since I have to handle other things recently.

Please test the following host_tagset patches which is against recent
linus tree(v4.17-rc4+)

https://github.com/ming1/linux/commits/v4.16-rc-host-tags-v5

And please post the perf trace without and with this patchset if
possible.

Thanks,
Ming Lei



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