Re: awful request merge results while simulating high IOPS multipath

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Subject: Re: awful request merge results while simulating high IOPS multipath
From: Jens Axboe <axboe@xxxxxxxxx>
Date: Wed, 25 Feb 2015 07:11:41 -0800
Cc: jmoyer@xxxxxxxxxx, shivakrishna.merla@xxxxxxxxxx, dm-devel@xxxxxxxxxx, Bart Van Assche <bvanassche@xxxxxxx>
In-reply-to: <alpine.LNX.2.00.1502250401330.32385@localhost.lm.intel.com>
References: <1424796250-38553-1-git-send-email-snitzer@redhat.com> <1424796250-38553-5-git-send-email-snitzer@redhat.com> <54ECAC08.7040603@kernel.dk> <20150224172259.GA39226@redhat.com> <54ECBA78.6020204@kernel.dk> <20150224181257.GA11444@redhat.com> <54ECC000.40604@kernel.dk> <20150224183256.GA11566@redhat.com> <20150225005608.GA13348@redhat.com> <alpine.LNX.2.00.1502250401330.32385@localhost.lm.intel.com>
Reply-to: device-mapper development <dm-devel@xxxxxxxxxx>
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On 02/24/2015 08:14 PM, Keith Busch wrote:

To be honest, we also see underwhelming performance on high IOPS PCIe
SSDs. We know of some bottlenecks and ideas to test, but hoping to work
out the kinks in those ideas before Vault in two weeks.


Related to merging, or?

--
Jens Axboe

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Follow-Ups:
- Re: awful request merge results while simulating high IOPS multipath
  - From: Busch, Keith

References:
- [PATCH 0/4] dm: simplify request-based DM a bit and an RFC-like perf tweak
  - From: Mike Snitzer
- [RFC PATCH 4/4] dm: delay running the queue slightly during request completion
  - From: Mike Snitzer
- Re: [RFC PATCH 4/4] dm: delay running the queue slightly during request completion
  - From: Jens Axboe
- [RFC PATCH 4/4 v2] dm: delay running the queue slightly during request completion
  - From: Mike Snitzer
- Re: [RFC PATCH 4/4 v2] dm: delay running the queue slightly during request completion
  - From: Jens Axboe
- Re: [RFC PATCH 4/4 v2] dm: delay running the queue slightly during request completion
  - From: Mike Snitzer
- Re: [RFC PATCH 4/4 v2] dm: delay running the queue slightly during request completion
  - From: Jens Axboe
- Re: [RFC PATCH 4/4 v2] dm: delay running the queue slightly during request completion
  - From: Mike Snitzer
- awful request merge results while simulating high IOPS multipath
  - From: Mike Snitzer
- Re: awful request merge results while simulating high IOPS multipath
  - From: Keith Busch

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