Robert Hancock wrote: >>> This has only been reported on one person's MSI board. Apparently >>> another revision of the same board is reported to work, and I can't >>> duplicate the problem on my Asus board, so it could just be some >>> hardware problem on that motherboard. >> >> IIRC, I have two from suse bug reports and both resolved with adma=0. >> I'm not too sure whether post 2.6.23-rcX changes would have fixed those >> problems tho. FWIW, I've disabled ADMA mode on all suse products. > > A hotplug-related problem? Have a link to the reports? Hmmm... I mis-remembered. The reporter said it was okay in SL102 (2.6.18, no ADMA) but SL103 (2.6.22, ADMA is on) fell apart. I asked for retest w/ adma=0 but no response yet. https://bugzilla.novell.com/show_bug.cgi?id=347184 I tried to reproduce the problem on my a8n-e but couldn't. >> Technically, they're regressions from pre-ADMA days - pretty grave ones >> considering some of the failure modes include hard lock up. Also, they >> don't seem resolvable in foreseeable future at this point. If this >> isn't gonna improve, I think we should just drop ADMA support altogether >> and concentrate on stabilizing non-ADMA operation. Stability is far >> more important than small performance improvements or feature supports. > > The suspend/resume problem should be resolvable. It worked before and > should be able to work again. Hopefully debug output with console > enabled during resume may provide some hints.. Okay. > The cache flush timeout problem is a bit onerous, but hopefully we can > figure something out there with some more debugging by the reporter. :-( >> But, yeah, you're right in that the change might cause more problems. >> What's your estimation of such possibility? I generally feel good about >> non-ADMA mode operation as they seem to solve most reported sata_nv bugs >> but I haven't really followed sata_nv code changes recently. > > It's hard to say what may come up if we do this. I seem to recall that > there were some reports of wierd hotplug issues and high latencies on > register access that went away with ADMA mode. > > I do think it's likely too late in the -rc series to make such a change > though. Hopefully by 2.6.25 we'll either have the issues fixed or have > more of an idea whether they can be. I feel pretty uncomfortable with the current situation. Two mostly working operation modes w/o any doc and known unresolved issues on both. Eeeek. :-( -- tejun - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
