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Message-ID: <538F391B.8070005@kernel.dk> Date: Wed, 04 Jun 2014 09:19:55 -0600 From: Jens Axboe <axboe@...nel.dk> To: Christoph Hellwig <hch@...radead.org> CC: Shaohua Li <shli@...nel.org>, linux-kernel@...r.kernel.org Subject: Re: [patch]blk-mq: blk_mq_tag_to_rq should handle flush request On 2014-06-04 09:16, Christoph Hellwig wrote: > On Wed, Jun 04, 2014 at 09:11:47AM -0600, Jens Axboe wrote: >> On 2014-06-04 09:10, Christoph Hellwig wrote: >>> On Wed, Jun 04, 2014 at 09:08:12AM -0600, Jens Axboe wrote: >>>>> The performance regression is caused by "blk-mq: avoid code >>>>> duplication", but I don't really understand why yet. >>>> >>>> Gah, looks like this one dropped the tag idling. I bet that is why. >>> >>> Ah, thanks. It's indeed exactly the same sort of slow down I bisected >>> back then, this should have rung a bell instead of keeping me occupied >>> for hours.. >> >> Patch is committed :-) > > Oh well, I had just prepared the same one for you, but I want to at > least do basic sanity checking of my rebased tree with the fixes applied > now that I'm done bisecting. Please do. If there's anything else I need, let me know. It wasn't clear to me if the cdb patch was in blk-mq or scsi-mq. I'll flush my queue out this afternoon, so that -rc1 will hopefully have everything in a sane state. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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