Re: PCI speed??
The freeBSD folks have some useful hardware notes at
http://www.freebsd.org/releases/4.7R/hardware-alpha.html.
On Tuesday 15 October 2002 09:23 am, Richard Fillion wrote:
> Wow, dont i feel like a moron now. eheh. Of course it means
> 100Mbyte/sec, what was i thinking?? The sad thing is that i do os
> development. lol
>
> I tried doing "hdparm -d1 /dev/hde", which from what i read on the net
> is what enables DMA on disks. The performance was the same.
>
> This is a Digital Server 3305, i dont know what "name" it has (ie:
> miata), /proc/cpuinfo lists it as a Noritake, which is the only name
> which i've found for this box.
>
> http://www.compaq.com/alphaserver/archive/3300/
>
> That could probably tell you more information about it than what i could
> say, and it would be more correct than i. eheh. The Ultra100 and the
> harddrive (Seagate Barracuda 60gig 7200RPM ATA100) i added myself.
>
> And on a side note...if anyone has memory which would fit this thing,
> willing to sell for a reasonable price, please contact me, i hate
> swapping.
>
> Richard Fillion
> rick@rhix.ods.org
>
> On Tue, 2002-10-15 at 01:54, Bart-Jan Vrielink wrote:
> > On di, 2002-10-15 at 03:52, Richard Fillion wrote:
> > > I recently ran an hdparm -t test on my ide disk (new ATA100 one) against
> > > my original scsi disk, and it lost, by quite a bit too. After some
> > > toying around i realized that the ide-disk module was using 33Mhz for
> > > transfers. It's an Ultra100 controller, so it better damn well do more
> > > than 33Mhz. So i tried unloading the module and reloading it with
> > > "idebus=66", but i get errors saying its not a valid option.
> >
> > Ultra100 means that the highest rate it has is 100 Mbyte/second over the
> > ide cable, which has nothing to do with the clockfrequency on the PCI
> > bus in MHz. 33 MHz is more than fast enough for IDE disks, because the
> > theoretial maximal rate the PCI bus has is 132 Mbyte/sec. This idebus
> > parameter is needed for systems with a VESA local bus (as found on many
> > i486 systems), where the busspeed can be 33, 40 or 50 MHz.
> >
> > And if you really read that message carefully, it says it uses this
> > value only for PIO modes, while for performance you'll want to use DMA
> > modes instead of PIO modes.
> >
> > > So, i was wondering, do alphas only have 33mhz pci buses or something?
> > > is there a reason i cant get over that speed going? 7megs/sec transfer
> > > isnt exactly lightning fast. Especially seeing how i use it for swap
> > > now too.
> >
> > All Alpha's I have use either SCSI or NFS, but I believe that many
> > Alpha's are not known for their fast IDE performance. If you tell us
> > what type of Alpha you have, maybe someone else on this list can tell
> > you what to do.
> >
> > --
> > Tot ziens,
> > Bart-Jan Vrielink
> >
> >
> > --
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>
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