Justin Erenkrantz <[EMAIL PROTECTED]> wrote:
>
>apr_sendfile doesn't have an implementation in APR defined for
>HP-UX. I do know that HP has different sendfile() semantics than
>Solaris or FreeBSD. I seem to remember Linus Torvalds mentioning
>on lkml that HP-UX had "braindamage" in its sendfile implementation:
The problem with sendfile() is the way it is frequently used in
conjunction with write() or writev() -- you use write() to send some
headers and then sendfile() for the bulk data. This usually means that
you get a forced packet boundary between the headers and the file
data, which usually means you aren't making the most of the MTU. HP/UX
addresses this issue by including an iovec in the sendfile() call for
the header; FreeBSD adds a second iovec for the trailer. However this
still leaves you with a forced packet boundary between files. Linux
doesn't include any iovecs in sendfile(); instead you must use
setsockopt(TCP_CORK) to prevent undesired packet boundaries.
Tony.
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