From: Alan Stern <stern@rowland.harvard.edu>
To: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Ming Lei <tom.leiming@gmail.com>, Jens Axboe <axboe@kernel.dk>,
Ming Lei <ming.lei@redhat.com>,
Bart Van Assche <Bart.VanAssche@wdc.com>,
"hch@lst.de" <hch@lst.de>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
"hare@suse.de" <hare@suse.de>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"rjw@rjwysocki.net" <rjw@rjwysocki.net>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"jejb@linux.vnet.ibm.com" <jejb@linux.vnet.ibm.com>,
"adrian.hunter@intel.com" <adrian.hunter@intel.com>
Subject: Re: [PATCH RFC V2 3/3] scsi_mq: enable runtime PM
Date: Wed, 18 Jul 2018 11:01:52 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1807181058440.31764-100000@netrider.rowland.org> (raw)
In-Reply-To: <20180718141852.i3aermgwhmvxwjx7@linux-x5ow.site>
On Wed, 18 Jul 2018, Johannes Thumshirn wrote:
> On Wed, Jul 18, 2018 at 10:12:37AM -0400, Alan Stern wrote:
> > As one extra reminder... People who care about extreme performance can
> > perfectly well disable CONFIG_PM in their kernels. That should remove
> > any overhead due to runtime PM.
>
> Yes but how likely is this for people who are running their data
> center with a distribution kernel.
Strictly speaking, that's a nonsense question. People who run
distribution kernels are 100% unlikely to change the kernel
configuration, by definition.
That's not the point. If people really care about getting the utmost
performance, to the extent that they resent the minimal overhead
required for runtime PM, then they should not be running distribution
kernels in the first place.
Alan Stern
next prev parent reply other threads:[~2018-07-18 15:01 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-13 8:05 [PATCH RFC V2 0/3] blk-mq: support runtime PM Ming Lei
2018-07-13 8:06 ` [PATCH RFC V2 1/3] block: put runtime PM code into common helpers Ming Lei
2018-07-17 13:21 ` Christoph Hellwig
2018-07-13 8:06 ` [PATCH RFC V2 2/3] blk-mq: prepare for supporting runtime PM Ming Lei
2018-07-13 20:16 ` Alan Stern
2018-07-17 13:23 ` Christoph Hellwig
2018-07-13 8:06 ` [PATCH RFC V2 3/3] scsi_mq: enable " Ming Lei
2018-07-17 13:24 ` Christoph Hellwig
2018-07-17 15:30 ` Ming Lei
2018-07-17 15:34 ` Bart Van Assche
2018-07-17 15:38 ` Ming Lei
2018-07-17 19:50 ` hch
2018-07-17 20:54 ` Alan Stern
2018-07-17 21:49 ` Jens Axboe
2018-07-18 12:06 ` Ming Lei
2018-07-18 12:28 ` Johannes Thumshirn
2018-07-18 12:37 ` Ming Lei
2018-07-18 14:12 ` Alan Stern
2018-07-18 14:18 ` Johannes Thumshirn
2018-07-18 15:01 ` Alan Stern [this message]
2018-07-19 6:41 ` Johannes Thumshirn
2018-07-19 14:35 ` Alan Stern
2018-07-19 14:43 ` Johannes Thumshirn
2018-07-18 14:50 ` Jens Axboe
2018-07-18 18:46 ` Alan Stern
2018-07-18 23:08 ` Ming Lei
2018-07-18 12:43 ` Hannes Reinecke
2018-07-18 13:05 ` Ming Lei
2018-07-13 14:21 ` [PATCH RFC V2 0/3] blk-mq: support " Jens Axboe
2018-07-14 2:37 ` Ming Lei
2018-07-14 2:54 ` Jens Axboe
2018-07-16 16:21 ` Bart Van Assche
2018-07-16 16:03 ` Bart Van Assche
2018-07-17 1:12 ` Ming Lei
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