From: "Mulyadi Santosa" <mulyadi.santosa@gmail.com>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] i8254 - Cannot change Timer frequency
Date: Sat, 11 Oct 2008 12:15:37 +0700 [thread overview]
Message-ID: <f284c33d0810102215w181fcd7dy61f206ad05fbc67@mail.gmail.com> (raw)
In-Reply-To: <1223657696.48ef88e0224fa@imp.free.fr>
Hi Adrien...
On Fri, Oct 10, 2008 at 11:54 PM, adrien lebre <lebre.adrien@free.fr> wrote:
> Re: i8254 - Cannot change Timer frequency
> by alebre on Wed Sep 17, 2008 4:37 pm
>
> What is the behavior of QEMU with regard to such instructions ?
> Does QEMU emulate the I8254 chip or does it simply forward the instruction to
> the host OS ? In that case, the host OS could simply does not consider such an
> instruction ?
I can not really answer about the i8524 emulation behaviour, but all I
know is that Qemu will turn it into setitimer() or RTC reprogramming
(via /dev/rtc). So the chance is, the granularity could be not as fine
as you expect. Especially if you end up using OS supplied timer, the
granularity will be 1/HZ.
Not an expert...just want to share my thoughts.
regards,
Mulyadi.
prev parent reply other threads:[~2008-10-11 5:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-10 16:54 [Qemu-devel] i8254 - Cannot change Timer frequency adrien lebre
2008-10-11 5:15 ` Mulyadi Santosa [this message]
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