Re: PCI_LATENCY_TIMER

B. James Phillippe (bryan@terran.org)
Sun, 27 Sep 1998 11:53:05 -0700 (PDT)

On Sun, 27 Sep 1998, Gerard Roudier wrote:
> On Sun, 27 Sep 1998, Mike Black wrote:
>
> > Here's my question: I've got a network server that primarily uses SCSI,
> > IDE, and a 100BaseT Network Card. All other PCI devices (e.g VGA) are not
> > used much. How do I optimize this setup for the SCSI/Network IDE/Network
> > throughput with the understanding that generally only SCSI or IDE access is
> > happening at one time??
> >
> > I see that my SCSI, IDE and Netcard report:
> > SCSI Latency: 8 min, 8 max, 64 set, cache line size 08
> > IDE Latency: 64 set
> > Network Latency: 8 min, 28 max, 64 set
>
> Let me translate this output into PCI language:

Hello. Perhaps someone can comment on my PCI device settings:

PCI devices found:
Bus 0, device 13, function 0:
Display controller: DEC DC21030 (TGA) (rev 3).
Medium devsel. Fast back-to-back capable. Master Capable.
Latency=255.
Prefetchable 32 bit memory at 0x8000000.
Bus 0, device 11, function 0:
Ethernet controller: DEC DC21040 (rev 36).
Medium devsel. Fast back-to-back capable. IRQ 15. Master Capable.
Latency=255.
I/O at 0x8000.
Non-prefetchable 32 bit memory at 0x11000000.
Bus 0, device 7, function 0:
Non-VGA device: Intel 82378IB (rev 132).
Medium devsel. Master Capable. No bursts.
Bus 0, device 6, function 0:
SCSI storage controller: NCR 53c810 (rev 2).
Medium devsel. IRQ 11. Master Capable. Latency=255.
I/O at 0x8800.
Non-prefetchable 32 bit memory at 0x11001000.

Notice the CFLT of every single PCI device in my system is 255. Perhaps
someone can explain? The system is AlphaStation 200 (Avanti, 21064A)
booting from SRM console. The kernel is 2.0.35.

cheers,
-bp

--
B. James Phillippe	. bryan@terran.org
UNIX Software Engineer	. http://www.terran.org/~bryan
Member since 1.1.59	. finger:bryan@earth.terran.org
MOTM: Waiting for the DSL to go in :)




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