Re: [Lse-tech] Re: ext3 performance bottleneck as the number of spindles gets large

David Lang
2002-06-23T08:16:13Z

most chipsets only have one PCI bus on them so any others need to be
bridged to that one.

David Lang

On Sun, 23 Jun 2002, Christopher E. Brown wrote:

> Date: Sun, 23 Jun 2002 01:55:28 -0600 (MDT)
> From: Christopher E. Brown <cbrown@woods.net>
> To: Dave Hansen <haveblue@us.ibm.com>
> Cc: William Lee Irwin III <wli@holomorphy.com>,
> Andreas Dilger <adilger@clusterfs.com>,
> "Griffiths, Richard A" <richard.a.griffiths@intel.com>,
> 'Andrew Morton' <akpm@zip.com.au>, mgross@unix-os.sc.intel.com,
> 'Jens Axboe' <axboe@suse.de>,
> Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
> lse-tech@lists.sourceforge.net
> Subject: Re: [Lse-tech] Re: ext3 performance bottleneck as the number of
> spindles gets large
>
> On Sun, 23 Jun 2002, Dave Hansen wrote:
>
> > William Lee Irwin III wrote:
> > > On Sun, Jun 23, 2002 at 12:29:23AM -0700, Dave Hansen wrote:
> > >> Yep, 2 independent busses per quad. That's a _lot_ of busses
> > >> when you have an 8 or 16 quad system. (I wonder who has one of
> > >> those... ;) Almost all of the server-type boxes that we play with
> > >> have multiple PCI busses. Even my old dual-PPro has 2.
> > >
> > > I thought I saw 3 PCI and 1 ISA per-quad., but maybe that's the
> > > "independent" bit coming into play.
> > >
> > Hmmmm. Maybe there is another one for the onboard devices. I thought
> > that there were 8 slots and 4 per bus. I could
> > be wrong. BTW, the ISA slot is EISA and as far as I can tell is only
> > used for the MDC.
>
>
> Do you mean independent in that there are 2 sets of 4 slots each
> detected as a seperate PCI bus, or independent in that each set of 4
> had *direct* access to the cpu side, and *does not* access via a
> PCI:PCI bridge?
>
>
>
> I have stacks of PPro/PII/Xeon boards around, but 9 out of 10 have
> chianed buses. Even the old PPro x 6 (Avion 6600/ALR 6x6/Unisys
> HR/HS6000) had 2 PCI buses, however the second BUS hung off of a
> PCI:PCI bridge.
>
>
> --
> I route, therefore you are.
>
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