Re: [PATCH] SCSI: run queue if SCSI device queue isn't ready and queue is idle

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, 2017-12-07 at 09:31 +0800, Ming Lei wrote:
> But if you always call blk_mq_sched_mark_restart_hctx() before a new
> dispatch, that may affect performance on NVMe which may never trigger
> BLK_STS_RESOURCE.

Hmm ... only the SCSI core implements .get_budget() and .put_budget() and
I proposed to insert a blk_mq_sched_mark_restart_hctx() call under "if
(q->mq_ops->get_budget)". In other words, I proposed to insert a
blk_mq_sched_mark_restart_hctx() call in a code path that is never triggered
by the NVMe driver. So I don't see how the change I proposed could affect
the performance of the NVMe driver?

Bart.




[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux