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 Topic: Is "EnableSendfile off" necessary? |
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lunter
Joined: 12 May 2011
Posts: 10
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CamaroSS
Joined: 24 Jan 2013
Posts: 78
Location: RF, Tver
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 Posted: Mon 11 Feb '13 15:58 Post subject: |
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| I think it's necessary on non-server versions of Windows. On Win Server 2008 R2, I get better results with this option enabled. |
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japi
Joined: 05 Jan 2013
Posts: 6
Location: Frankfurt
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| Posted: Mon 11 Feb '13 21:46 Post subject: |
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I had to disable it (Windows Server 2008 R2), because my server kept crashing/hanging.
If you plan to use SSL (I do) and your server crashes without reason, have a look at http://www.apachelounge.com/viewtopic.php?t=4862
It seems to be a known bug with SSL and disabling EnableSendfile is part of the workaround.
Since using the settings suggested in that thread I had no single crash. 
If you don't need SSL then you may have better performance keeping it enabled.
Best regards |
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glsmith
Moderator
Joined: 16 Oct 2007
Posts: 2268
Location: Sun Diego, USA
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| Posted: Mon 11 Feb '13 23:42 Post subject: |
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In 2.4 it's off by default, so turning it off does nothing.
http://httpd.apache.org/docs/2.4/mod/core.html#enablesendfile
As far as the SSL problem, it's not just SSL and the AcceptEx() problem was fixed with the directives
AccetFilter protocol none
EnableMMAP which was part of the posted solution defaults to On, this might have been what was causing crashing for the above poster.
http://httpd.apache.org/docs/2.4/mod/core.html#enablemmap
It carries two warnings with it;
1. On some multiprocessor systems, memory-mapping can reduce the performance of the httpd
2. Deleting or truncating a file while httpd has it memory-mapped can cause httpd to crash with a segmentation fault.
I myself leave both EnableSendfile and EnableMMAP at their default. If I have file downloads larger than ~80MB, I also have an .htaccess file in the directory turning EnableSendFile On and EnableMMAP Off. I find I get the best performance this way. |
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