OpenSolaris's Apache httpd (really APR) has disabled the use of sendfile for a long time. The patch to disable it references CR 6452545, which was for a kernel memory use problem; that CR was closed earlier this year, with a comment stating that it could not be reproduced.

Are there any known performance or reliability issues in the socket layer of recent dev levels of OpenSolaris to consider before re-enabling sendfile use by httpd?

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