From: Charles Cazabon <charlesc-lists-btrfs@pyropus.ca>
To: btrfs list <linux-btrfs@vger.kernel.org>
Subject: Re: Oddly slow read performance with near-full largish FS
Date: Wed, 24 Dec 2014 21:14:13 -0600 [thread overview]
Message-ID: <20141225031413.GA5864@pyropus.ca> (raw)
In-Reply-To: <54976811.2060507@pobox.com>
Robert White <rwhite@pobox.com> wrote:
>
> You have very little free memory.
I think you're mistaken. Every diagnostic I've looked at says the opposite.
>From 30 seconds ago on the same machine, after unmounting the big btrfs
filesystem (and with a larger xfs one mounted), /proc/meminfo says almost the
entirety of the machine's 16GB is free:
MemTotal: 16469880 kB
MemFree: 16005392 kB
MemAvailable: 15974244 kB
Buffers: 84 kB
[...]
> This is called "demand paging",
Yes, I'm aware of how this works.
Charles
--
-----------------------------------------------------------------------
Charles Cazabon
GPL'ed software available at: http://pyropus.ca/software/
-----------------------------------------------------------------------
next prev parent reply other threads:[~2014-12-25 3:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-17 2:42 Oddly slow read performance with near-full largish FS Charles Cazabon
2014-12-19 8:58 ` Satoru Takeuchi
2014-12-19 16:58 ` Charles Cazabon
2014-12-19 17:33 ` Duncan
2014-12-20 8:53 ` Chris Murphy
2014-12-20 10:03 ` Robert White
2014-12-20 10:57 ` Robert White
2014-12-21 16:32 ` Charles Cazabon
2014-12-21 21:32 ` Robert White
2014-12-21 22:53 ` Charles Cazabon
2014-12-22 0:38 ` Robert White
2014-12-25 3:14 ` Charles Cazabon [this message]
2014-12-22 14:16 ` Austin S Hemmelgarn
2014-12-25 3:15 ` Charles Cazabon
2014-12-22 2:13 ` Satoru Takeuchi
2014-12-25 3:18 ` Charles Cazabon
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=20141225031413.GA5864@pyropus.ca \
--to=charlesc-lists-btrfs@pyropus.ca \
--cc=linux-btrfs@vger.kernel.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;
as well as URLs for NNTP newsgroup(s).