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Posted to bugs@httpd.apache.org by bu...@apache.org on 2012/05/17 13:15:55 UTC
[Bug 53253] New: TCP_NOPUSH used with sendfile(2), cause transfers
to freeze for a few seconds
https://issues.apache.org/bugzilla/show_bug.cgi?id=53253
Priority: P2
Bug ID: 53253
Assignee: bugs@httpd.apache.org
Summary: TCP_NOPUSH used with sendfile(2), cause transfers to
freeze for a few seconds
Severity: major
Classification: Unclassified
OS: other
Reporter: ftigeot@wolfpond.org
Hardware: PC
Status: NEW
Version: 2.4-HEAD
Component: Core
Product: Apache httpd-2
Created attachment 28797
--> https://issues.apache.org/bugzilla/attachment.cgi?id=28797&action=edit
Remove the use of TCP_NOPUSH with sendfile(2)
Having updated a web server to apache-2.4 (sendfile enabled), I noticed
some static images didn't load in one go:
- top parts were displayed instantly
- image downloads were frozen for a few seconds
- missing bottom parts were then downloaded and displayed instantly
Switching EnableSendfile between on/off in httpd.conf enables or disables
this behavior 100% of the time
After some investigation, it was found this behavior was caused by the use
of APR_TCP_NOPUSH in the code path using sendfile(2).
Once patch-server_core_filters.c.txt is applied, Apache-2.4 works perfectly
fine with sendfile.
DragonFly BSD bug report:
http://bugs.dragonflybsd.org/issues/2368
pkgsrc problem report:
http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=46458
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[Bug 53253] TCP_NOPUSH used with sendfile(2), cause transfers to
freeze for a few seconds
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53253
François Tigeot <ft...@wolfpond.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ftigeot@wolfpond.org
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[Bug 53253] TCP_NOPUSH used with sendfile(2), cause transfers to
freeze for a few seconds
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53253
Christophe JAILLET <ch...@wanadoo.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |PatchAvailable
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[Bug 53253] TCP_NOPUSH used with sendfile(2), cause transfers to
freeze for a few seconds
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53253
--- Comment #1 from Joe Orton <jo...@redhat.com> ---
Created attachment 29020
--> https://issues.apache.org/bugzilla/attachment.cgi?id=29020&action=edit
possible fix for TCP_NOPUSH usage
Can you try this patch instead?
Coverity's static analysis noticed a bug in this code which could well explain
the symptoms you're seeing here.
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[Bug 53253] TCP_NOPUSH used with sendfile(2), cause transfers to
freeze for a few seconds
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53253
--- Comment #2 from François Tigeot <ft...@wolfpond.org> ---
I'm sadly unable to reproduce the original issue with Apache 2.4.10.
The last patch doesn't have any visible effect.
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