Re: [PATCH V2 0/2] block: remove unnecessary RESTART

On Oct 31, 2017, at 7:46 PM, Ming Lei [off-list ref] wrote:
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On Tue, Oct 31, 2017 at 02:29:32PM -0600, Jens Axboe wrote:

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On 10/26/2017 10:43 PM, Ming Lei wrote:
Hi Jens,
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The 1st patch removes the RESTART for TAG-SHARED because SCSI handles it=

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by itself, and not necessary to waste CPU to do the expensive RESTART.
And Roman Pen reported that this RESTART cuts half of IOPS in his case.
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The 2nd patch removes the RESTART when .get_budget returns BLK_STS_RESOU=

RCE,

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and this RESTART is handled by SCSI's RESTART(scsi_end_request()) too.

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What base is this against?

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The for-next branch of your block tree:

=46rom when? Doesn=E2=80=99t apply at all today.=20