Open IPMI does check that and use it when available.

If your KCS transaction time is less than 20ms, open ipmi use it.

Otherwise, use make menuconfig to select the high resolution timer, after 
rebuild your kernel.

JM

-----Message d'origine-----
De : Andrzej Niemcewicz [mailto:[EMAIL PROTECTED] 
Envoyé : Tuesday, December 05, 2006 10:31 AM
À : Audet, Jean-Michel
Cc : David A. Ranch; ipmitool-devel
Objet : Re: [Ipmitool-devel] KCS with interrupts

How can I check if high resolution timer is available in my system?

Andrzej

Dnia 5-12-2006 o godz. 14:52 Audet Jean-Michel napisał(a):
> It is for KCS transaction speed.  
> 
> Today, with the latest kernel and new timers with better resolution, the 
> difference is not very big between an implementation in interrupt or in 
> polling.  
> 
> When no high resolution timer was available, the KCS speed was at least 
> 20 times slower than now.  A transaction that is now taking 5ms to 10ms 
> was taking 200ms before. 
> 
> Jean-Michel Audet
> 
> -----Message d'origine-----
> De : [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] De la part de 
> David A. Ranch
> EnvoyÊ : Monday, December 04, 2006 9:37 PM
> À : ipmitool-devel
> Objet : Re: [Ipmitool-devel] KCS with interrupts
> 
> 
> Curious, what's the benefit of an interrupt-based IPMI setup?  Better 
> response for things like traps, SOL, etc. compared to polling?  As it 
> stands, the dmidecode for these Supermicro cards doesn't say anything 
> about interrupts:
> 
> ...
> Handle 0x0030
>         DMI type 38, 12 bytes.
>         IPMI Device Information
> 
> [that's it for IPMI]
> 
> --Davod
> 
> > Hi,
> > Was anyone able to enable interrupts on KCS interface (Open IPMI 
> driver)?
> >
> > When I send: 
> > modprobe ipmi_si type=kcs irqs=9
> >
> > after 'dmesg |grep ipmi' I get:
> > ipmi message handler version 33.11
> > ipmi_si: Found SMBIOS-specified state machine at I/O address 0xca2, 
> slave addres
> > s 0x20
> >
> > and 'cat /proc/ipmi/0/si_stats' shows:
> > interrupts_enabled:    0 
> >
> > Regards,
> > Andrzej 
> >
> > ----------------------------------------------------
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