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RE: [Qemu-devel] /dev/rtc issues

From: Dor Laor
Subject: RE: [Qemu-devel] /dev/rtc issues
Date: Sat, 11 Aug 2007 23:30:53 -0700

>Like others have reported to the list I'm getting:
>Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a
>error, but for better emulation accuracy either use a 2.6 host Linux
>kernel or
>type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.

It's might be HPET that bothers rtc.
You can apply Luca's HPET support for qemu patch.

>and then
>address@hidden ~]# echo 1024 > /proc/sys/dev/rtc/max-user-freq
>-bash: /proc/sys/dev/rtc/max-user-freq: No such file or directory
>address@hidden ~]# uname -a
>Linux arturo #1 SMP Wed Aug 1 15:15:33 EDT 2007 i686
>i686 i386 GNU/Linux
>I guess this is due to changes in the latest host kernel, in particular
>to Dyntick, introduced in 2.6.21 (see http://lwn.net/Articles/223185/).
>Does anybody know whether/how this affects qemu and kqemu operation?
>Thanks in advance,

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