From: cosmoslx lin <cosmoslx@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] IO latency issues
Date: Sun, 10 Mar 2013 07:53:31 +0800 [thread overview]
Message-ID: <CAPuZL-E-ZiBneD6z3gzK7fmRU5pRpOfuWfmiwBf=Ct_ywdkkcQ@mail.gmail.com> (raw)
In-Reply-To: <513B804D.2030308@googlemail.com>
[-- Attachment #1: Type: text/plain, Size: 2187 bytes --]
I have try the BFQ patch outside of the kernel mainline, it works well.
Maybe you would like to see:
http://algo.ing.unimo.it/people/paolo/disk_sched/
Also there is a 15-minute demo of the performance of BFQ:
http://youtu.be/J-e7LnJblm8
2013/3/10 Volker Armin Hemmann <volkerarmin@googlemail.com>
> Am 09.03.2013 19:15, schrieb Florian Philipp:
> > Hi list!
> >
> > Whenever I do sequential IO for a long stretch of time (e.g. md5summing
> > 40 GB), I'm experiencing high load (ca. 6 on a 4 CPU system) and
> > temporary freezes of most applications. For example, switching between
> > tabs in konsole sometimes takes more than 2 seconds.
> >
> > When doing this on an ext4 filesystem, the load seems to result from
> > khugepaged and kswapd0 as well as some kworkers.
> >
> > I think I've had similar issues with NFS over wifi but I cannot test
> > this now.
> >
> > Today I copied 60GB from my hard disk to an USB disk formatted with
> > NTFS, issuing the copy command from KDE's dolphin. The freezes became so
> > long it was impossible to work and then X11 locked up and had to be
> killed.
> >
> > I tried using a preemptive kernel but that didn't seem to help. blkio
> > and cpu cgroups didn't help either. Ionice seems to be the only solution
> > but while I'm okay with that, my dad won't be. Can anyone tell me what
> > is causing this behavior?
> >
> > Throughput is good, by the way. That's why I don't suspect a driver
> issue.
> >
> > Thanks in advance!
> > Florian Philipp
> >
> congratulation. You hit 'the bug'. Been around for ages, but for magical
> reasons kernel dev are unable to see or unable to do something about it.
> If you are using a vanilla kernel, posting on lkml might be the right
> thing to do.
>
>
--
Best regards!
------------------------------------------------
Yu-yu Lin(林育宇)
The Guangdong Key Laboratory of Information Security Technology (IST),
School of Information Science and Technology,
Sun Yat-sen (Zhongshan) University (中山大学),
Guangzhou,P.R.China.
Email: cosmoslx@gmail.com
------------------------------------------------ <cosmoslx@gmail.com>
[-- Attachment #2: Type: text/html, Size: 2924 bytes --]
next prev parent reply other threads:[~2013-03-09 23:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-09 18:15 [gentoo-user] IO latency issues Florian Philipp
2013-03-09 18:32 ` Volker Armin Hemmann
2013-03-09 23:53 ` cosmoslx lin [this message]
2013-03-10 12:48 ` Florian Philipp
2013-03-10 22:23 ` Florian Philipp
2013-03-11 16:00 ` cosmoslx lin
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='CAPuZL-E-ZiBneD6z3gzK7fmRU5pRpOfuWfmiwBf=Ct_ywdkkcQ@mail.gmail.com' \
--to=cosmoslx@gmail.com \
--cc=gentoo-user@lists.gentoo.org \
/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