When processing the header of HTTP responses from Xend, libvirt currently reads data a single byte at a time. Since its using lowlevel UNIX read() function there is no buffering, which results in a large number of system calls. The attached patch re-factors the code so that it reads data in 4k chunks whenever possible. Since most rsponses are < 4k in size processing the response now only takes two read() syscalls, rather than several hundred. Of course most (90%) of the CPU overhead is still on the Xend/XenStored end of the channel, but that's out of our control until the XML-RPC API comes along. Regards, Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=|