Re: Wow! Is memory ever cheap!

Matthew Jacob
2001-05-09T19:58:52Z

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On Wed, 9 May 2001, [ISO-8859-1] Gérard Roudier wrote:

>
>
> On Tue, 8 May 2001, Dan Hollis wrote:
>
> > On Tue, 8 May 2001, Larry McVoy wrote:
> > > which is a text version of the paper I mentioned before. The basic
> > > message of the paper is that it really doesn't help much to have things
> > > like ECC unless you can be sure that 100% of the rest of your system
> > > has similar checks.
> >
> > UDMA has crc, scsi has parity, pci has (i think) parity, tcpip has crc,
> > your cpu l1 and l2 have ecc...
>
> SCSI Ultra-160 has CRC.
>
> PCI has parity (btw, you think right), but only a few drivers make sure
> PCI parity checking is enabled. On the other hand, a PCI parity error

Sun's panic if they get SERR or PERR.

> should be considered as extremally serious and the system should be
> stopped when such happens.
>
> Btw, it seems (read at the pci list) that the original PCI hadn't parity.
> After all, PCI had been designed for PC machines... :)
>
> > Looks like similar checks are already there.
> >
> > -Dan
> >
> Gérard.
>
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