Jeff Garzik writes:
> Linus Torvalds wrote:
> The overhead of the extra stat and mmap/munmap syscalls seemed to be the
> thing that slowed things down. sendfile was pretty fast, but still an
> extra syscall, with an annoyingly large error handling case [only
> certain files can be sendfile'd]
That error handling case sure does discourage sendfile use.
> I sure would like an O_STREAMING flag, though... let a user app hint to
> the system that the pages it is reading or writing are perhaps less
> likely to be reused, or access randomly.... A copy-file syscall would
> be nice, too, but that's just laziness talking....
You have a laptop computer with a USB-connected Ethernet.
You mount a NetApp or similar box via the SMB/CIFS protocol.
You see a multi-gigabyte file. You make a copy... ouch!!!
For each gigabyte, you hog the network for an hour.
Now let's say this file is for a MacOS app. You have to
preserve the creator, file type, resource fork, etc.
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This archive was generated by hypermail 2b29 : Thu Aug 15 2002 - 22:00:25 EST