dead.org; linux-bl...@vger.kernel.org; paolo.vale...@linaro.org
> Subject: Re: Device or HBA level QD throttling creates randomness in
> sequetial workload
>
> On 01/30/2017 09:30 AM, Bart Van Assche wrote:
> > On Mon, 2017-01-30 at 19:22 +0530, Kashyap Desai wrote:
> >> - if
; linux-kernel@vger.kernel.org;
>> h...@infradead.org; linux-bl...@vger.kernel.org; paolo.vale...@linaro.org
>> Subject: Re: Device or HBA level QD throttling creates randomness in
>> sequetial workload
>>
>> On 01/30/2017 09:30 AM, Bart Van Assche wrote:
>>>
On 01/30/2017 09:30 AM, Bart Van Assche wrote:
> On Mon, 2017-01-30 at 19:22 +0530, Kashyap Desai wrote:
>> - if (atomic_inc_return(&instance->fw_outstanding) >
>> - instance->host->can_queue) {
>> - atomic_dec(&instance->fw_outstanding);
>> - return SCSI_MLQUEUE_HOST_BUSY;
On Mon, 2017-01-30 at 19:22 +0530, Kashyap Desai wrote:
> - if (atomic_inc_return(&instance->fw_outstanding) >
> - instance->host->can_queue) {
> - atomic_dec(&instance->fw_outstanding);
> - return SCSI_MLQUEUE_HOST_BUSY;
> - }
> + if (atomic_inc_return(&instance->fw_out
#x27;Jens Axboe'; 'Omar Sandoval'
> Cc: 'linux-s...@vger.kernel.org'; 'linux-kernel@vger.kernel.org'; 'linux-
> bl...@vger.kernel.org'; 'Christoph Hellwig'; 'paolo.vale...@linaro.org'
> Subject: RE: Device or HBA level QD throttlin
Sandoval
> Cc: linux-s...@vger.kernel.org; linux-kernel@vger.kernel.org; linux-
> bl...@vger.kernel.org; Christoph Hellwig; paolo.vale...@linaro.org
> Subject: Re: Device or HBA level QD throttling creates randomness in
> sequetial
> workload
>
> Hi,
>
> One guess would be that
Hi,
One guess would be that this isn't around a requeue condition, but
rather the fact that we don't really guarantee any sort of hard FIFO
behavior between the software queues. Can you try this test patch to see
if it changes the behavior for you? Warning: untested...
diff --git a/block/blk-mq.
vger.kernel.org; linux-
> > bl...@vger.kernel.org; ax...@kernel.dk; Christoph Hellwig;
> > paolo.vale...@linaro.org
> > Subject: Re: Device or HBA level QD throttling creates randomness in
> sequetial
> > workload
> >
> > On Mon, Oct 24, 2016 at 06:35:01PM +0530, Ka
lwig;
> paolo.vale...@linaro.org
> Subject: Re: Device or HBA level QD throttling creates randomness in
sequetial
> workload
>
> On Mon, Oct 24, 2016 at 06:35:01PM +0530, Kashyap Desai wrote:
> > >
> > > On Fri, Oct 21, 2016 at 05:43:35PM +0530, Kashyap Desai wrote:
> > &
On Mon, Oct 24, 2016 at 06:35:01PM +0530, Kashyap Desai wrote:
> >
> > On Fri, Oct 21, 2016 at 05:43:35PM +0530, Kashyap Desai wrote:
> > > Hi -
> > >
> > > I found below conversation and it is on the same line as I wanted some
> > > input from mailing list.
> > >
> > > http://marc.info/?l=linux-ke
>
> On Fri, Oct 21, 2016 at 05:43:35PM +0530, Kashyap Desai wrote:
> > Hi -
> >
> > I found below conversation and it is on the same line as I wanted some
> > input from mailing list.
> >
> > http://marc.info/?l=linux-kernel&m=147569860526197&w=2
> >
> > I can do testing on any WIP item as Omar men
mited penalty for Sequential Work load on HDD ?
>
> ` Kashyap
>
> > -Original Message-
> > From: Kashyap Desai [mailto:kashyap.de...@broadcom.com]
> > Sent: Thursday, October 20, 2016 3:39 PM
> > To: linux-s...@vger.kernel.org
> > Subject: Device or HBA level QD
s...@vger.kernel.org
> Subject: Device or HBA level QD throttling creates randomness in
sequetial
> workload
>
> [ Apologize, if you find more than one instance of my email.
> Web based email client has some issue, so now trying git send mail.]
>
> Hi,
>
> I am doing some pe
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