From: Tejun Heo <tj@kernel.org>
To: Miao Xie <miaoxie@huawei.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>, linux-kernel@vger.kernel.org
Subject: Re: [BUG]Writeback Cgroup/Dirty Throttle: very small buffered write thoughput caused by writeback cgroup and dirty thottle
Date: Fri, 27 May 2016 14:24:09 -0400 [thread overview]
Message-ID: <20160527182409.GR23194@mtj.duckdns.org> (raw)
In-Reply-To: <57357029.5030002@huawei.com>
Hello,
Sorry about the delay. I forgot about this thread.
On Fri, May 13, 2016 at 02:11:53PM +0800, Miao Xie wrote:
> Better than the kernel without patch. Now the benchmark could reach
> the device bandwidth after 5-8 seconds. But at the beginning, it
> was still very slow, and its thoughput was only 4MB/s for ~4
> seconds, then it could go up in 1~3 seconds.
I see. As this fix is needed anyways, I'll send it up. As for the
ramp-up, it could be normal. There are estimators which take running
avg and modulate the threshold accordingly and the starting values are
conservative, so a short ramp-up time can be coming from that.
Thanks.
--
tejun
next prev parent reply other threads:[~2016-05-27 18:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <57333E75.3080309@huawei.com>
2016-05-12 1:11 ` Miao Xie
2016-05-12 15:32 ` Tejun Heo
2016-05-13 6:11 ` Miao Xie
2016-05-27 18:24 ` Tejun Heo [this message]
2016-05-27 18:34 ` [PATCH block/for-4.7-fixes] writeback: use higher precision calculation in domain_dirty_limits() Tejun Heo
2016-05-30 8:05 ` Jan Kara
2016-05-30 14:55 ` Jens Axboe
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=20160527182409.GR23194@mtj.duckdns.org \
--to=tj@kernel.org \
--cc=fengguang.wu@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=miaoxie@huawei.com \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®