From: jonathan.derrick@intel.com (Jon Derrick)
Subject: [PATCH 1/2] Block: Disable polling stats when iostats are disabled
Date: Tue, 8 Mar 2016 10:58:11 -0700 [thread overview]
Message-ID: <20160308175811.GA8867@localhost.localdomain> (raw)
In-Reply-To: <56DF0E21.4000907@dev.mellanox.co.il>
>
> I fail to see how replacing incrementation with a branch statement helps
> performance or even not making it worse...
It may have been coincidental in my setup - I had assumed the test on the local io_stat was cheaper than the cost of following hctx to then increment (or not) poll_invoked.
next prev parent reply other threads:[~2016-03-08 17:58 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-08 17:34 [PATCH 0/2] Some performance fixes for fastpath Jon Derrick
2016-03-08 17:34 ` [PATCH 1/2] Block: Disable polling stats when iostats are disabled Jon Derrick
2016-03-08 17:38 ` Sagi Grimberg
2016-03-08 17:58 ` Jon Derrick [this message]
2016-03-08 17:40 ` Jens Axboe
2016-03-08 18:02 ` Jon Derrick
2016-03-08 17:34 ` [PATCH 2/2] NVMe: Remove unused sq_head read in completion path Jon Derrick
2016-03-08 17:40 ` Sagi Grimberg
2016-03-08 17:41 ` Jens Axboe
2016-03-09 7:54 ` Johannes Thumshirn
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