Bug #2368
closed
sendfile(2) freezes for a few seconds
100%
Description
Having updated a web server to apache-2.4 (sendfile enabled), I noticed
some static images didn't load in one go:
- top parts are displayed instantly
- image downloads freeze for a few seconds
- missing bottom parts are then downloaded and displayed instantly
Switching EnableSendfile between on/off in httpd.conf enables or disables
this behavior 100% of the time
Files
Updated by sepherosa over 12 years ago
On Thu, May 17, 2012 at 3:07 AM, Francois Tigeot via Redmine
<bugtracker-admin@leaf.dragonflybsd.org> wrote:
Issue #2368 has been reported by Francois Tigeot.
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Bug #2368: sendfile(2) freezes for a few seconds
http://bugs.dragonflybsd.org/issues/2368Author: Francois Tigeot
Status: New
Priority: Normal
Assignee:
Category:
Target version:Having updated a web server to apache-2.4 (sendfile enabled), I noticed
some static images didn't load in one go:- top parts are displayed instantly
- image downloads freeze for a few seconds
- missing bottom parts are then downloaded and displayed instantlySwitching EnableSendfile between on/off in httpd.conf enables or disables
this behavior 100% of the time
Possible to get a tcpdump (w/ -s 128 should be ok)?
Best Regards,
sephe
--
Tomorrow Will Never Die
Updated by ftigeot over 12 years ago
- File tcpdump-sendfile.txt tcpdump-sendfile.txt added
I've reproduced the issue with a single file (the DragonFly logo).
Complete URL is http://dl.wolfpond.org/small_logo.png
Trace attached.
Now that I'm always using the same image, I've noticed the download systematically freezes in the same place, at about 90% of the height.
Updated by ftigeot over 12 years ago
- Status changed from New to Closed
- % Done changed from 0 to 100
This bug is caused by the use of TCP_NOPUSH in association with sendfile(2) in the Apache-2.4 code.
Thanks for Sepherosa Ziehau for pointing it.
Bug reports will be filled with pkgsrc and the upstream project.
Updated by sepherosa over 12 years ago
On Thu, May 17, 2012 at 5:50 PM, Francois Tigeot via Redmine
<bugtracker-admin@leaf.dragonflybsd.org> wrote:
Issue #2368 has been updated by Francois Tigeot.
Status changed from New to Closed
% Done changed from 0 to 100This bug is caused by the use of TCP_NOPUSH in association with sendfile(2) in the Apache-2.4 code.
Please test unpatched apache-2.4 w/ the following commit.
3533a1834a0ba3a7c441ede5120c3720d8a34c4c
Best Regards,
sephe
Thanks for Sepherosa Ziehau for pointing it.
Bug reports will be filled with pkgsrc and the upstream project.
----------------------------------------
Bug #2368: sendfile(2) freezes for a few seconds
http://bugs.dragonflybsd.org/issues/2368Author: Francois Tigeot
Status: Closed
Priority: Normal
Assignee:
Category:
Target version:Having updated a web server to apache-2.4 (sendfile enabled), I noticed
some static images didn't load in one go:- top parts are displayed instantly
- image downloads freeze for a few seconds
- missing bottom parts are then downloaded and displayed instantlySwitching EnableSendfile between on/off in httpd.conf enables or disables
this behavior 100% of the time--
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--
Tomorrow Will Never Die
Updated by ftigeot over 12 years ago
Stock apache-2.4 works fine with the last commit.
Apache bug report:
https://issues.apache.org/bugzilla/show_bug.cgi?id=53253
Pkgsrc problem report:
http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=46458