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Re: PCI latency and VGA drivers
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: PCI latency and VGA drivers
- From: Graeme Gill <graeme@colorstar.com.au>
- Date: Wed, 11 Mar 1998 10:29:57 +1100
- Resent-Date: Tue, 10 Mar 1998 17:17:41 -0800
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-ID: <"Uj0t52.0.bm.sBU1r"@electra.znyx.com>
- Resent-Sender: pci-sig-request@znyx.com
Kevin Normoyle wrote:
> It would have been better to have an agreed on limit to number of retries,
> that hardware everywhere could trap on.
>
> Basically, every chipset that seems to implement retry limit counters has
> to disable them when they finally ship. (Because no limit is workable, for
> the code that's out there).
>
> So I think PCI dug its own hole here. (by not being heavy-handed up
> front with retry-limit detection)
If the intent of the retry mechanism was to allow backoff to
resolve deadlock situations, then I guess a small retry
limit would have been entirely appropriate. Can anyone
relate the reasoning behind making retries effectively open
ended ?
Graeme Gill.