From: Johannes Thumshirn <jthumshirn@suse.de>
To: Sagi Grimberg <sagi@grimberg.me>,
linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-rdma@vger.kernel.org, target-devel@vger.kernel.org
Subject: Re: [PATCH rfc 09/10] nvmet: Use non-selective polling
Date: Thu, 9 Mar 2017 14:54:47 +0100 [thread overview]
Message-ID: <74284e7b-ae3f-4bbd-c28a-2dccab58cdc0@suse.de> (raw)
In-Reply-To: <1489065402-14757-10-git-send-email-sagi@grimberg.me>
On 03/09/2017 02:16 PM, Sagi Grimberg wrote:
> It doesn't really make sense to do selective polling
> because we never care about specific IOs. Non selective
> polling can actually help by doing some useful work
> while we're submitting a command.
>
> We ask for a batch of (magic) 4 completions which looks
> like a decent network<->backend proportion, if less are
> available we'll see less.
>
> Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
> ---
Just out of curiosity, how did you come up with the magic 4?
Thanks,
Johannes
--
Johannes Thumshirn Storage
jthumshirn@suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N�rnberg
GF: Felix Imend�rffer, Jane Smithard, Graham Norton
HRB 21284 (AG N�rnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
WARNING: multiple messages have this Message-ID (diff)
From: Johannes Thumshirn <jthumshirn@suse.de>
To: Sagi Grimberg <sagi@grimberg.me>,
linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-rdma@vger.kernel.org, target-devel@vger.kernel.org
Subject: Re: [PATCH rfc 09/10] nvmet: Use non-selective polling
Date: Thu, 9 Mar 2017 14:54:47 +0100 [thread overview]
Message-ID: <74284e7b-ae3f-4bbd-c28a-2dccab58cdc0@suse.de> (raw)
In-Reply-To: <1489065402-14757-10-git-send-email-sagi@grimberg.me>
On 03/09/2017 02:16 PM, Sagi Grimberg wrote:
> It doesn't really make sense to do selective polling
> because we never care about specific IOs. Non selective
> polling can actually help by doing some useful work
> while we're submitting a command.
>
> We ask for a batch of (magic) 4 completions which looks
> like a decent network<->backend proportion, if less are
> available we'll see less.
>
> Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
> ---
Just out of curiosity, how did you come up with the magic 4?
Thanks,
Johannes
--
Johannes Thumshirn Storage
jthumshirn@suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
WARNING: multiple messages have this Message-ID (diff)
From: jthumshirn@suse.de (Johannes Thumshirn)
Subject: [PATCH rfc 09/10] nvmet: Use non-selective polling
Date: Thu, 9 Mar 2017 14:54:47 +0100 [thread overview]
Message-ID: <74284e7b-ae3f-4bbd-c28a-2dccab58cdc0@suse.de> (raw)
In-Reply-To: <1489065402-14757-10-git-send-email-sagi@grimberg.me>
On 03/09/2017 02:16 PM, Sagi Grimberg wrote:
> It doesn't really make sense to do selective polling
> because we never care about specific IOs. Non selective
> polling can actually help by doing some useful work
> while we're submitting a command.
>
> We ask for a batch of (magic) 4 completions which looks
> like a decent network<->backend proportion, if less are
> available we'll see less.
>
> Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
> ---
Just out of curiosity, how did you come up with the magic 4?
Thanks,
Johannes
--
Johannes Thumshirn Storage
jthumshirn at suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: Felix Imend?rffer, Jane Smithard, Graham Norton
HRB 21284 (AG N?rnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
next prev parent reply other threads:[~2017-03-09 13:55 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-09 13:16 [PATCH rfc 00/10] non selective polling block interface Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` [PATCH rfc 01/10] nvme-pci: Split __nvme_process_cq to poll and handle Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:57 ` Johannes Thumshirn
2017-03-09 13:57 ` Johannes Thumshirn
2017-03-09 13:57 ` Johannes Thumshirn
2017-03-22 19:07 ` Christoph Hellwig
2017-03-22 19:07 ` Christoph Hellwig
2017-03-22 19:07 ` Christoph Hellwig
2017-03-09 13:16 ` [PATCH rfc 02/10] nvme-pci: Add budget to __nvme_process_cq Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:46 ` Johannes Thumshirn
2017-03-09 13:46 ` Johannes Thumshirn
2017-03-09 13:46 ` Johannes Thumshirn
2017-03-22 19:08 ` Christoph Hellwig
2017-03-22 19:08 ` Christoph Hellwig
2017-03-09 13:16 ` [PATCH rfc 03/10] nvme-pci: open-code polling logic in nvme_poll Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:56 ` Johannes Thumshirn
2017-03-09 13:56 ` Johannes Thumshirn
2017-03-09 13:56 ` Johannes Thumshirn
2017-03-22 19:09 ` Christoph Hellwig
2017-03-22 19:09 ` Christoph Hellwig
2017-03-22 19:09 ` Christoph Hellwig
2017-03-09 13:16 ` [PATCH rfc 04/10] block: Add a non-selective polling interface Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:44 ` Johannes Thumshirn
2017-03-09 13:44 ` Johannes Thumshirn
2017-03-09 13:44 ` Johannes Thumshirn
2017-03-10 3:04 ` Damien Le Moal
2017-03-10 3:04 ` Damien Le Moal
2017-03-13 8:26 ` Sagi Grimberg
2017-03-13 8:26 ` Sagi Grimberg
2017-03-09 16:25 ` Bart Van Assche
2017-03-09 16:25 ` Bart Van Assche
2017-03-09 16:25 ` Bart Van Assche
2017-03-13 8:15 ` Sagi Grimberg
2017-03-13 8:15 ` Sagi Grimberg
2017-03-14 21:21 ` Bart Van Assche
2017-03-14 21:21 ` Bart Van Assche
2017-03-14 21:21 ` Bart Van Assche
2017-03-09 13:16 ` [PATCH rfc 05/10] nvme-pci: Support blk_poll_batch Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` [PATCH rfc 06/10] IB/cq: Don't force IB_POLL_DIRECT poll context for ib_process_cq_direct Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 16:30 ` Bart Van Assche
2017-03-09 16:30 ` Bart Van Assche
2017-03-09 16:30 ` Bart Van Assche
2017-03-13 8:24 ` Sagi Grimberg
2017-03-13 8:24 ` Sagi Grimberg
2017-03-14 21:32 ` Bart Van Assche
2017-03-14 21:32 ` Bart Van Assche
2017-03-14 21:32 ` Bart Van Assche
2017-03-09 13:16 ` [PATCH rfc 07/10] nvme-rdma: Don't rearm the CQ when polling directly Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:52 ` Johannes Thumshirn
2017-03-09 13:52 ` Johannes Thumshirn
2017-03-09 13:52 ` Johannes Thumshirn
2017-03-09 13:16 ` [PATCH rfc 08/10] nvme-rdma: Support blk_poll_batch Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` [PATCH rfc 09/10] nvmet: Use non-selective polling Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:54 ` Johannes Thumshirn [this message]
2017-03-09 13:54 ` Johannes Thumshirn
2017-03-09 13:54 ` Johannes Thumshirn
2017-03-09 13:16 ` [PATCH rfc 10/10] target: " Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-09 13:16 ` Sagi Grimberg
2017-03-18 23:58 ` Nicholas A. Bellinger
2017-03-18 23:58 ` Nicholas A. Bellinger
2017-03-18 23:58 ` Nicholas A. Bellinger
2017-03-21 11:35 ` Sagi Grimberg
2017-03-21 11:35 ` Sagi Grimberg
2017-03-21 11:35 ` Sagi Grimberg
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