> > When writing a big file to a ubd disk, everything in uml slows down to > > a crawl, even though CPU usage is minimal. > > What exactly is your test case?
Something like: dd if=/host/tmp/bigfile of=/tmp/bigfile bs=1048576 count=100 and run 'top' or 'watch something' in another terminal, which sometimes completely stops updating during the write. > I have some patches which theoretically should help I/O performance > which I've been sitting on because I can't find a case where they > help. It's not I/O performance I'm worried about, but scheduling latencies. CPU use inside and outside the UML is minimal, so I can't see where this slowdown comes from. Miklos - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
