linux-kernel - Re: [PATCH 0/3] Convert from bio-based to blk-mq v2

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Message-ID: <20131018154801.GQ16716@linux.intel.com>
Date:	Fri, 18 Oct 2013 11:48:01 -0400
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Matias Bjorling <m@...rling.me>
Cc:	axboe@...nel.dk, keith.busch@...el.com,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org
Subject: Re: [PATCH 0/3] Convert from bio-based to blk-mq v2

On Fri, Oct 18, 2013 at 03:14:19PM +0200, Matias Bjorling wrote:
> Performance study:
> 
> System: HGST Research NVMe prototype, Haswell i7-4770 3.4Ghz, 32GB 1333Mhz

I don't have one of these.  Can you provide more details about it,
such as:
 - How many I/O queues does it have?
 - Are the interrupts correctly bound to the CPUs (for both sets of tests)?
   The driver isn't allowed to set the irq affinity correctly itself;
   it can only set a hint and userspace (eg irqbalance) has to set the
   affinity correctly
 - Does it support interrupt coalescing?  If so, have you managed to do any
   testing using that feature?
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