linux-kernel - Re: [PATCH v7] NVMe: conversion to blk-mq

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Date:	Fri, 13 Jun 2014 09:16:41 -0600 (MDT)
From:	Keith Busch <keith.busch@...el.com>
To:	Jens Axboe <axboe@...com>
cc:	Keith Busch <keith.busch@...el.com>,
	Matias Bjørling <m@...rling.me>,
	Matthew Wilcox <willy@...ux.intel.com>,
	"sbradshaw@...ron.com" <sbradshaw@...ron.com>,
	"tom.leiming@...il.com" <tom.leiming@...il.com>,
	"hch@...radead.org" <hch@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
Subject: Re: [PATCH v7] NVMe: conversion to blk-mq

On Fri, 13 Jun 2014, Jens Axboe wrote:
> On 06/13/2014 09:05 AM, Keith Busch wrote:
>> Here are the performance drops observed with blk-mq with the existing
>> driver as baseline:
>>
>>  CPU : Drop
>>  ....:.....
>>    0 : -6%
>>    8 : -36%
>>   16 : -12%
>
> We need the hints back for sure, I'll run some of the same tests and
> verify to be sure. Out of curiousity, what is the topology like on your
> box? Are 0/1 siblings, and 0..7 one node?

0-7 are different cores on node 0, with 16-23 being their thread
siblings. Similiar setup with 8-15 and 24-32 on node 1.
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