Avi Kivity wrote:
Michael Malone wrote:
Hi everyone,
I've written a couple of questions regarding the serial device in
KVM. After slightly more investigation I think I have found what's
going awry. Correct me if I'm wrong, but I believe that KVM
generates an interrupt for every single character it sends through
the serial port. This throws CPU usage through the roof and I
suspect this means that the timers aren't being handled correctly and
it failed on a string of 0's for me due to the timing slips.
GNU/Linux and Windows don't have anywhere near the processor usage
for their serial ports. Now, I know nothing of serial programming
and don't have any time to investigate it too heavily just now, but I
have pulled down the source and had a look through that, but it looks
to be doing the right thing (I suppose?). I was mainly wondering
how GNU/Linux and windows handle serial interrupts or if some of the
serial character events could be buffered, rather than overload the
processor? I guess this is a low priority for you, but any help
would be greatly appreciated (And when I have some more time, I will
spend some of it helping to develop KVM! Quid pro quo, Clarice...)
What version of kvm are you testing? There were some changes to the
serial emulation recently. See for example
02f0b4c0cc26f3a2578d515d96781f5a6258888d in kvm-73.
I have tried with kvm 62, 69, 72 and 74. All of them gave the same
result. What do you mean by "See for example
02f0b4c0cc26f3a2578d515d96781f5a6258888d"?
- I am running Ubuntu 8.04 (Hardy) as host and Windows XP as guest on an
Intel Core 2 duo processor.
=======================================================================
This email, including any attachments, is only for the intended
addressee. It is subject to copyright, is confidential and may be
the subject of legal or other privilege, none of which is waived or
lost by reason of this transmission.
If the receiver is not the intended addressee, please accept our
apologies, notify us by return, delete all copies and perform no
other act on the email.
Unfortunately, we cannot warrant that the email has not been
altered or corrupted during transmission.
=======================================================================
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
