From: Johannes Thumshirn <jthumshirn@suse.de>
To: Sagi Grimberg <sagi@grimberg.me>
Cc: Jens Axboe <axboe@kernel.dk>,
"lsf-pc@lists.linux-foundation.org"
<lsf-pc@lists.linux-foundation.org>,
linux-block@vger.kernel.org, Linux-scsi@vger.kernel.org,
linux-nvme@lists.infradead.org,
Christoph Hellwig <hch@infradead.org>,
Keith Busch <keith.busch@intel.com>
Subject: Re: [LSF/MM TOPIC][LSF/MM ATTEND] NAPI polling for block drivers
Date: Tue, 17 Jan 2017 17:27:52 +0100 [thread overview]
Message-ID: <20170117162752.GE6067@linux-x5ow.site> (raw)
In-Reply-To: <53a3fb6c-c75a-519a-f669-2bcab404e01d@grimberg.me>
On Tue, Jan 17, 2017 at 06:15:43PM +0200, Sagi Grimberg wrote:
> Oh, and the current code that was tested can be found at:
>
> git://git.infradead.org/nvme.git nvme-irqpoll
Just for the record, all tests you've run are with the upper irq_poll_budget of
256 [1]?
We (Hannes and me) recently stumbed accross this when trying to poll for more
than 256 queue entries in the drivers we've been testing.
Did your system load reduce with irq polling? In theory it should but I have
seen increases with AHCI at least according to fio. IIRC Hannes saw decreases
with his SAS HBA tests, as expected.
[1] lib/irq_poll.c:13
Byte,
Johannes
--
Johannes Thumshirn Storage
jthumshirn@suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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next prev parent reply other threads:[~2017-01-17 16:27 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-11 13:43 [LSF/MM TOPIC][LSF/MM ATTEND] NAPI polling for block drivers Johannes Thumshirn
2017-01-11 13:46 ` Hannes Reinecke
2017-01-11 15:07 ` Jens Axboe
2017-01-11 15:13 ` Jens Axboe
2017-01-12 8:23 ` Sagi Grimberg
2017-01-12 10:02 ` Johannes Thumshirn
2017-01-12 11:44 ` Sagi Grimberg
2017-01-12 12:53 ` Johannes Thumshirn
2017-01-12 14:41 ` [Lsf-pc] " Sagi Grimberg
2017-01-12 18:59 ` Johannes Thumshirn
2017-01-17 15:38 ` Sagi Grimberg
2017-01-17 15:45 ` Sagi Grimberg
2017-01-20 12:22 ` Johannes Thumshirn
2017-01-17 16:15 ` Sagi Grimberg
2017-01-17 16:27 ` Johannes Thumshirn [this message]
2017-01-17 16:38 ` Sagi Grimberg
2017-01-18 13:51 ` Johannes Thumshirn
2017-01-18 14:27 ` Sagi Grimberg
2017-01-18 14:36 ` Andrey Kuzmin
2017-01-18 14:40 ` Sagi Grimberg
2017-01-18 15:35 ` Andrey Kuzmin
2017-01-18 14:58 ` Johannes Thumshirn
2017-01-18 15:14 ` Sagi Grimberg
2017-01-18 15:16 ` Johannes Thumshirn
2017-01-18 15:39 ` Hannes Reinecke
2017-01-19 8:12 ` Sagi Grimberg
2017-01-19 8:23 ` Sagi Grimberg
2017-01-19 9:18 ` Johannes Thumshirn
2017-01-19 9:13 ` Johannes Thumshirn
[not found] ` <CANvN+emx1-F3iAY45t1_MQRcijw7sf1jPvjwv0uh8A3GzzQwMg@mail.gmail.com>
2017-01-17 16:50 ` Sagi Grimberg
2017-01-18 14:02 ` Hannes Reinecke
2017-01-20 0:13 ` Jens Axboe
2017-01-13 15:56 ` Johannes Thumshirn
2017-01-11 15:16 ` Hannes Reinecke
2017-01-12 4:36 ` Stephen Bates
2017-01-12 4:44 ` Jens Axboe
2017-01-12 4:56 ` Stephen Bates
2017-01-19 10:57 ` Ming Lei
2017-01-19 11:03 ` Hannes Reinecke
2017-01-11 16:08 ` Bart Van Assche
2017-01-11 16:12 ` hch
2017-01-11 16:15 ` Jens Axboe
2017-01-11 16:22 ` Hannes Reinecke
2017-01-11 16:26 ` Bart Van Assche
2017-01-11 16:45 ` Hannes Reinecke
2017-01-12 8:52 ` sagi grimberg
2017-01-11 16:14 ` Johannes Thumshirn
2017-01-12 8:41 ` Sagi Grimberg
2017-01-12 19:13 ` Bart Van Assche
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