From: George Anzinger <george@mvista.com>
To: Serge Goodenko <s_goodenko@mail.ru>
Cc: linux-kernel@vger.kernel.org,
high-res-timers-discourse@lists.sourceforge.net
Subject: Re: [PATCH] UML + High-Res-Timers on 2.4.25 kernel
Date: Thu, 13 Oct 2005 12:44:54 -0700 [thread overview]
Message-ID: <434EB936.3070600@mvista.com> (raw)
In-Reply-To: <E1EPxwT-0009q3-00.s_goodenko-mail-ru@f24.mail.ru>
Serge Goodenko wrote:
> ~
>>>is there any solution to this problem?
>>>or HRT patch is not supposed to work under UML at all?
>>>
>>
>>You might do better on the HRT list (cc'ed).
>>
>>I don't know what UML needs. I would have thought that jiffies would be defined... especially for
>>things like do_fork. Which patch are you using?
HRT (in all its versions) requires the availability of a hardware timer to provide an interrupt at
timer expiry. I am not sure how this is done in UML but my guess is that the host kernel would need
to have HRT running on it. Then the UML kernel(s) would transform the HRT requests into the proper
user call to the host.
>
>
> Well, as far as I understood recently HRT patch is not what I exactly need. It provides just API for using in user space applications and I need to use High-Resolution timer in kernel (particulary in TCP/IP stack)...
> therefore my problem now is to find suitable hi-res timer patch for use in 2.4 kernel...
There are several 2.4 HRT patches on the HRT site, see signature below.
Still, these patches do not provide kernel access to the high-res timers. This has been done in one
case, but the interface is not really defined nor stable (i.e. we may change it in the next
release...). Look for HIGH_RES_TIMERS in the ipmi driver in the 2.6 kernel tree to see how to go
about this.
> and I would be pleased if you could recommend me something...
>
> thanks,
>
> Serge, MIPT,
> Russia
>
>
> -
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--
George Anzinger george@mvista.com
HRT (High-res-timers): http://sourceforge.net/projects/high-res-timers/
next prev parent reply other threads:[~2005-10-13 19:46 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-07 13:24 [PATCH] UML + High-Res-Timers on 2.4.25 kernel Serge Goodenko
2005-10-07 16:21 ` George Anzinger
2005-10-13 7:55 ` Serge Goodenko
2005-10-13 19:44 ` George Anzinger [this message]
2005-10-14 8:02 ` Re[2]: " Serge Goodenko
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