On Mon, Nov 13, 2006 at 02:30:27PM -0500, Daniel Jacobowitz wrote: > I was trying to run GDB remote debug tests through a -redir socket > today. It crawled unbelievably. Paul guessed that slirp wasn't using > TCP_NODELAY, and Nagle was to blame. > > He was even righter than usual. Adding TCP_NODELAY speeds up this > particular workload by (very approximately) 54x. See trivial attached > patch. > > Is this going to bite other things, i.e. does it need to be > configurable?
No comments on this... My reasoning, by the way, was that slirp is being used as a TCP-to-TCP gateway. I think that if we were to use nagle here, we'd end up doing it twice: once at the sender inside the guest, and once again on the host's TCP stack. Using TCP_NODELAY lets the guest take responsibility. -- Daniel Jacobowitz CodeSourcery _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
