From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
To: "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: syncfs slower than without syncfs
Date: Wed, 07 Nov 2012 10:41:58 +0100 [thread overview]
Message-ID: <509A2CE6.1010100@profihost.ag> (raw)
Hello list,
syncfs is much slower than without syncfs to me.
If i compile latest ceph master with wip-rbd-read:
with syncfs:
rand 4K:
write: io=1133MB, bw=12853KB/s, iops=3213, runt= 90277msec
read : io=1239MB, bw=14046KB/s, iops=3511, runt= 90325msec
seq 4M:
write: io=37560MB, bw=423874KB/s, iops=103, runt= 90738msec
read : io=103852MB, bw=1151MB/s, iops=287, runt= 90237msec
without syncfs:
rand 4K:
write: io=3733MB, bw=42459KB/s, iops=10614, runt= 90039msec
read : io=6018MB, bw=68446KB/s, iops=17111, runt= 90038msec
seq 4M:
write: io=51204MB, bw=577328KB/s, iops=140, runt= 90820msec
read : io=150320MB, bw=1666MB/s, iops=416, runt= 90228msec
I thought syncfs should boost the performance.
Greets,
Stefan
next reply other threads:[~2012-11-07 9:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-07 9:41 Stefan Priebe - Profihost AG [this message]
2012-11-07 13:31 ` syncfs slower than without syncfs Stefan Priebe - Profihost AG
2012-11-07 15:04 ` Mark Nelson
2012-11-07 16:26 ` Stefan Priebe
2012-11-08 3:09 ` Josh Durgin
2012-11-08 8:52 ` Stefan Priebe - Profihost AG
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=509A2CE6.1010100@profihost.ag \
--to=s.priebe@profihost.ag \
--cc=ceph-devel@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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.