From: Jens Axboe <axboe@kernel.dk>
To: "hch@infradead.org" <hch@infradead.org>,
Bart Van Assche <Bart.VanAssche@sandisk.com>
Cc: "jthumshirn@suse.de" <jthumshirn@suse.de>,
"lsf-pc@lists.linux-foundation.org"
<lsf-pc@lists.linux-foundation.org>,
"Linux-scsi@vger.kernel.org" <Linux-scsi@vger.kernel.org>,
"keith.busch@intel.com" <keith.busch@intel.com>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"sagi@grimberg.me" <sagi@grimberg.me>
Subject: Re: [LSF/MM TOPIC][LSF/MM ATTEND] NAPI polling for block drivers
Date: Wed, 11 Jan 2017 09:15:26 -0700 [thread overview]
Message-ID: <5b2229ee-a225-b59f-ccdf-710767941920@kernel.dk> (raw)
In-Reply-To: <20170111161238.GA18881@infradead.org>
On 01/11/2017 09:12 AM, hch@infradead.org wrote:
> On Wed, Jan 11, 2017 at 04:08:31PM +0000, Bart Van Assche wrote:
>> A typical Ethernet network adapter delays the generation of an interrupt
>> after it has received a packet. A typical block device or HBA does not delay
>> the generation of an interrupt that reports an I/O completion.
>
> NVMe allows for configurable interrupt coalescing, as do a few modern
> SCSI HBAs.
Unfortunately it's way too coarse on NVMe, with the timer being in 100
usec increments... I've had mixed success with the depth trigger.
--
Jens Axboe
next prev parent reply other threads:[~2017-01-11 16:15 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
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 [this message]
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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