From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: Unstableness in grant table block drivers Date: Wed, 13 Apr 2005 21:25:15 -0500 Message-ID: <425DD48B.6050001@us.ibm.com> References: <425DCAC4.6030407@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: cwc22@cam.ac.uk Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Christopher Clark wrote: >Hello Anthony > >First off, hands up: this was my code and I just didn't get around to >sending the mail to the list as I had enough to deal with relocating >from the UK to the US last week. The code was, however, tested under >load and working fine, and I did consider it to be ready for wider >testing in unstable. > > Hi Christopher, My note was more of a suggestion for the future than a complaint. You guys in Cambridge move very quickly and it's hard for some of us outside to keep up :-) You guys just keep churning out cool stuff. >The machines you can't get to start domUs, and symptom of not finding >the root filesystem is exactly what you'd see if your dom0 and domU >configs don't match; either both or neither need to be using grant >tables for transport. Your other issues will need more investigation, >and a reproducable scenario would be extremely helpful indeed. > > Actually, this seems like it might be a common thread between all of our scenarios. I'm using (and I assume others) a standard dom0 config file that has all of my hardware enabled while I just use the default config file for domU. I'll try to confirm this tomorrow with the other people that were experiencing problems. Perhaps I'll run a copy of fsstress too and let you guys know the results. Regards, Anthony Liguori >Regards, > >Christopher > > >On 4/13/05, Anthony Liguori wrote: > > >>Ian Pratt wrote: >> >> >> >>>OK, that's news to us - we haven't seen any problems. >>> >>>It's been tested with dd's and kernel builds, and wasn't expected to be >>>a particularly dangerous change. >>> >>>How you confirmed that disabling the option fixes your problems? Can you >>>give a simple recipe to provoke problems? >>> >>> >>> >>We've had three different systems lose the ability to start domUs. >>Disabling VBD grant tables fixed the problem. The best reproducable >>example we have is default config on a domU from today's xen-unstable >>snapshot. /dev/console is not accessible and no valid root is found. >> >>In my own case, it was working fairly well and then it just stopped >>working. It would die mid-way through boot. Again, disabling VBD >>grant-tables fixed the problem. I'm going to look into the problem this >>evening and see if I can get you guys a more reproducable scenario. >> >> >> >>>It doesn't seem to be destablizing, at least for us. Possibly there's >>>been some feature interaction with later checkins. >>> >>> >>> >>> >>Possibly. >> >> >> >>>Anyone using the unstable tree should be reading the changelog >>>closely... >>> >>> >>> >>> >>I agree. I do, but I don't think a lot of people do. I'm not trying to >>give you guys more work to do :-) Just a quick note to xen-devel would >>suffice (if you've got an extra second). >> >>Thanks Ian, >> >>Regards, >>Anthony Liguori >> >> >> >>>Ian >>> >>> >>> >>> >>> >>_______________________________________________ >>Xen-devel mailing list >>Xen-devel@lists.xensource.com >>http://lists.xensource.com/xen-devel >> >> >> > > >