On 12/12/2005 08:38, Mike Silbersack wrote: > On Mon, 12 Dec 2005, Cedric Tabary wrote: > > >If it is true, doing a sendfile() on some very big files (even if not > >keeping the descriptor open after) will kill the cache ? > > > >Please help me to understand why this patch ? and the difference between > >sendfile() and mmap() at the memory or cache level.. > > > >Cédric > > My memory escapes me on all the details, but there were two potential > reasons not to use sendfile with 4.x that no longer apply in 5.x and > above: > > 1. Sendfile used to send small files inefficiently, sending the http > headers in one packet and the data in another. I fixed this in 5.x. > > 2. Alan Cox improved the memory efficiency of sendfile greatly, it now > uses a single kernel buffer for all copies of the same block of the same > file, whereas the old implementation made an in-kernel copy of each block, > making it no more memory efficient than using mbufs.
What about using sendfile() or mmap() on NFS ? Cédric _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
