linux-kernel - RE: [PATCH RFT 0/3] blk-mq: Optimise blk_mq_queue_tag_busy

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Date:   Thu, 25 Nov 2021 19:16:51 +0530
From:   Kashyap Desai <kashyap.desai@...adcom.com>
To:     John Garry <john.garry@...wei.com>, axboe@...nel.dk
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        ming.lei@...hat.com, hare@...e.de
Subject: RE: [PATCH RFT 0/3] blk-mq: Optimise blk_mq_queue_tag_busy_iter() for
 shared tags

> -----Original Message-----
> From: Kashyap Desai [mailto:kashyap.desai@...adcom.com]
> Sent: Monday, November 15, 2021 10:02 PM
> To: 'John Garry' <john.garry@...wei.com>; 'axboe@...nel.dk'
> <axboe@...nel.dk>
> Cc: 'linux-block@...r.kernel.org' <linux-block@...r.kernel.org>; 'linux-
> kernel@...r.kernel.org' <linux-kernel@...r.kernel.org>;
> 'ming.lei@...hat.com'
> <ming.lei@...hat.com>; 'hare@...e.de' <hare@...e.de>
> Subject: RE: [PATCH RFT 0/3] blk-mq: Optimise blk_mq_queue_tag_busy_iter()
> for shared tags
>
> > Hi Kashyap,
> >
> > Any chance you can try this series or give an update on the issue
> > reported earlier?
>
> John -
>
> I will try something this week and let you know.

John - I tested patchset and looks good.  Issue reported at below thread is
fixed.
https://lore.kernel.org/linux-block/e4e92abbe9d52bcba6b8cc6c91c442cc@mail.gmail.com/

Here is perf top data.

5.70%  [megaraid_sas]                [k] complete_cmd_fusion
   3.80%  [megaraid_sas]                [k]
megasas_build_and_issue_cmd_fusion
   2.75%  [kernel]                      [k] syscall_return_via_sysret
   2.68%  [kernel]                      [k] entry_SYSCALL_64
   2.22%  [kernel]                      [k] io_submit_one
   2.19%  [megaraid_sas]                [k] megasas_build_ldio_fusion
   1.95%  [kernel]                      [k] llist_add_batch
   1.80%  [kernel]                      [k] llist_reverse_order
   1.79%  [kernel]                      [k] scsi_complete
   1.73%  [kernel]                      [k] scsi_queue_rq
   1.66%  [kernel]                      [k] check_preemption_disabled
   1.37%  [megaraid_sas]                [k] megasas_queue_command
   1.16%  [kernel]                      [k] native_irq_return_iret
   1.11%  [kernel]                      [k] aio_complete_rw
   1.07%  [kernel]                      [k] read_tsc
   1.06%  fio                           [.] __fio_gettime
   1.05%  [kernel]                      [k] flush_smp_call_function_queue
   1.03%  [kernel]                      [k] blk_complete_reqs
   1.00%  [kernel]                      [k] blk_mq_free_request
   0.98%  [kernel]                      [k] sbitmap_get


I will continue testing and let you know how it goes.


Kashyap

>
> >
> > thanks @ Ming for the reviews.
> >
> > Cheers,
> > John
> >

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