Date: Tue, 10 Jan 2012 17:28:09 -0500 From: "Mikhail T." <mi+thun@aldan.algebra.com> To: fs@freebsd.org Subject: How to best send files over network? Message-ID: <4F0CBB79.7010704@aldan.algebra.com>
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Hello!
I'm trying to implement a BSD-tuned sending of files. Most of the files are
fairly large. I thought, sendfile(2) is the way to go, but, it seems, there are
severe performance problems at the moment for the files located on a ZFS.
mmap-ing the files and then write-ing them is claimed to be a lot faster. Could
somebody comment on this? Should one always mmap/write, or are there situations,
when sendfile is advantageous?
If, indeed, sendfile is best for UFS, but mmap/write is better over ZFS, what is
the best way to determine the underlying FS for each file? statfs(2) is supposed
to answer that question -- what should I look for in the struct statfs, that it
will return? Do I check, if f_fsid contains a magic number for ZFS, or look for
a magic string in f_fstypename? Could someone provide an example?
Thank you very much. Yours,
-mi
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