LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "Srivatsa S. Bhat" <srivatsa@csail.mit.edu>
To: Paolo Valente <paolo.valente@linaro.org>
Cc: linux-fsdevel@vger.kernel.org,
	linux-block <linux-block@vger.kernel.org>,
	linux-ext4@vger.kernel.org, cgroups@vger.kernel.org,
	kernel list <linux-kernel@vger.kernel.org>,
	Jens Axboe <axboe@kernel.dk>, Jan Kara <jack@suse.cz>,
	Jeff Moyer <jmoyer@redhat.com>, Theodore Ts'o <tytso@mit.edu>,
	amakhalov@vmware.com, anishs@vmware.com, srivatsab@vmware.com,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Linus Walleij <linus.walleij@linaro.org>
Subject: Re: CFQ idling kills I/O performance on ext4 with blkio cgroup controller
Date: Tue, 11 Jun 2019 15:34:48 -0700	[thread overview]
Message-ID: <7c5e9d11-4a3d-7df4-c1e6-7c95919522ab@csail.mit.edu> (raw)
In-Reply-To: <6a6f4aa4-fc95-f132-55b2-224ff52bd2d8@csail.mit.edu>

On 6/2/19 12:04 AM, Srivatsa S. Bhat wrote:
> On 5/30/19 3:45 AM, Paolo Valente wrote:
>>
[...]
>> At any rate, since you pointed out that you are interested in
>> out-of-the-box performance, let me complete the context: in case
>> low_latency is left set, one gets, in return for this 12% loss,
>> a) at least 1000% higher responsiveness, e.g., 1000% lower start-up
>> times of applications under load [1];
>> b) 500-1000% higher throughput in multi-client server workloads, as I
>> already pointed out [2].
>>
> 
> I'm very happy that you could solve the problem without having to
> compromise on any of the performance characteristics/features of BFQ!
> 
> 
>> I'm going to prepare complete patches.  In addition, if ok for you,
>> I'll report these results on the bug you created.  Then I guess we can
>> close it.
>>
> 
> Sounds great!
>

Hi Paolo,

Hope you are doing great!

I was wondering if you got a chance to post these patches to LKML for
review and inclusion... (No hurry, of course!)

Also, since your fixes address the performance issues in BFQ, do you
have any thoughts on whether they can be adapted to CFQ as well, to
benefit the older stable kernels that still support CFQ?

Thank you!

Regards,
Srivatsa
VMware Photon OS

  reply	other threads:[~2019-06-11 22:35 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-17 22:16 Srivatsa S. Bhat
2019-05-18 18:39 ` Paolo Valente
2019-05-18 19:28   ` Theodore Ts'o
2019-05-20  9:15     ` Jan Kara
2019-05-20 10:45       ` Paolo Valente
2019-05-21 16:48       ` Theodore Ts'o
2019-05-21 18:19         ` Josef Bacik
2019-05-21 19:10           ` Theodore Ts'o
2019-05-20 10:38     ` Paolo Valente
2019-05-21  7:38       ` Andrea Righi
2019-05-18 20:50   ` Srivatsa S. Bhat
2019-05-20 10:19     ` Paolo Valente
2019-05-20 22:45       ` Srivatsa S. Bhat
2019-05-21  6:23         ` Paolo Valente
2019-05-21  7:19           ` Srivatsa S. Bhat
2019-05-21  9:10           ` Jan Kara
2019-05-21 16:31             ` Theodore Ts'o
2019-05-21 11:25       ` Paolo Valente
2019-05-21 13:20         ` Paolo Valente
2019-05-21 16:21           ` Paolo Valente
2019-05-21 17:38             ` Paolo Valente
2019-05-21 22:51               ` Srivatsa S. Bhat
2019-05-22  8:05                 ` Paolo Valente
2019-05-22  9:02                   ` Srivatsa S. Bhat
2019-05-22  9:12                     ` Paolo Valente
2019-05-22 10:02                       ` Srivatsa S. Bhat
2019-05-22  9:09                   ` Paolo Valente
2019-05-22 10:01                     ` Srivatsa S. Bhat
2019-05-22 10:54                       ` Paolo Valente
2019-05-23  2:30                         ` Srivatsa S. Bhat
2019-05-23  9:19                           ` Paolo Valente
2019-05-23 17:22                             ` Paolo Valente
2019-05-23 23:43                               ` Srivatsa S. Bhat
2019-05-24  6:51                                 ` Paolo Valente
2019-05-24  7:56                                   ` Paolo Valente
2019-05-29  1:09                                   ` Srivatsa S. Bhat
2019-05-29  7:41                                     ` Paolo Valente
2019-05-30  8:29                                       ` Srivatsa S. Bhat
2019-05-30 10:45                                         ` Paolo Valente
2019-06-02  7:04                                           ` Srivatsa S. Bhat
2019-06-11 22:34                                             ` Srivatsa S. Bhat [this message]
2019-06-12 13:04                                               ` Jan Kara
2019-06-12 19:36                                                 ` Srivatsa S. Bhat
2019-06-13  6:02                                                   ` Greg Kroah-Hartman
2019-06-13 19:03                                                     ` Srivatsa S. Bhat
2019-06-13  8:20                                                   ` Jan Kara
2019-06-13 19:05                                                     ` Srivatsa S. Bhat
2019-06-13  8:37                                                   ` Jens Axboe
2019-06-13  5:46                                               ` Paolo Valente
2019-06-13 19:13                                                 ` Srivatsa S. Bhat
2019-05-23 23:32                           ` Srivatsa S. Bhat
2019-05-30  8:38                             ` Srivatsa S. Bhat

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=7c5e9d11-4a3d-7df4-c1e6-7c95919522ab@csail.mit.edu \
    --to=srivatsa@csail.mit.edu \
    --cc=amakhalov@vmware.com \
    --cc=anishs@vmware.com \
    --cc=axboe@kernel.dk \
    --cc=cgroups@vger.kernel.org \
    --cc=jack@suse.cz \
    --cc=jmoyer@redhat.com \
    --cc=linus.walleij@linaro.org \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-ext4@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=paolo.valente@linaro.org \
    --cc=srivatsab@vmware.com \
    --cc=tytso@mit.edu \
    --cc=ulf.hansson@linaro.org \
    --subject='Re: CFQ idling kills I/O performance on ext4 with blkio cgroup controller' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).