Messages in this thread | | | Subject | Re: gettimeofday order of magnitude slower with pmtimer, which is default | From | john stultz <> | Date | Wed, 22 Mar 2006 12:05:30 -0800 |
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On Wed, 2006-03-22 at 21:12 +0200, Avi Kivity wrote: > OGAWA Hirofumi wrote: > > john stultz <johnstul@us.ibm.com> writes: > > > > > >> In my TOD rework I've dropped the triple read, figuring if a problem > >> arose we could blacklist the specific box. This patch covers that, so it > >> looks like a good idea to me. > >> > >> I've not tested it myself, but if you feel good about it, please send it > >> to Andrew. > >> > > > > Current patch is the following. If I'm missing something, or you have > > some comment, please tell me. (Since I don't have ICH4, ICH4 detection > > is untested) > > > Doesn't it make sense to mark the port as user accessible in the I/O > permissions bitmap and export it as a vsyscall? that would save the > syscall overhead.
i386 doesn't yet have a vsyscall gtod. I had some code around earlier for it, but it still needed a good bit of work before it would be ready for mainline. If you're interested in working on this, I'd be happy to send them to you.
thanks -john
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