MAGENHEIMER,DAN (HP-FtCollins,ex1)
2004-Feb-17 21:35 UTC
[Xen-devel] Console getting disk debug output?
I''m trying to connect to a Xen (1.2) console via a terminal concentrator and, on boot, instead of getting console output I''m getting literally thousands of lines as follows: hdb: 0x0080 0x000001cb7376 [A] hdb: writing: LBAsect=30110710, sectors=128, buffer=0x00253000, LBAsect=0x000001 cb73f6 hdb: 0x0080 0x000001cb73f6 [A] hdb: writing: LBAsect=30110838, sectors=40, buffer=0x04b91000, LBAsect=0x000001c b7476 hdb: 0x0028 0x000001cb7476 [A] hdb: writing: LBAsect=4273198, sectors=8, buffer=0x050cd000, LBAsect=0x000000413 42e hdb: 0x0008 0x00000041342e [A] hdb: reading: LBAsect=9215350, sectors=128, buffer=0x005b5000, LBAsect=0x0000008 c9d76 Perhaps this is the wrong serial port, or ???? Please help! Thanks, Dan ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
> I''m trying to connect to a Xen (1.2) console via a terminal > concentrator and, on boot, instead of getting console output > I''m getting literally thousands of lines as follows: > > hdb: 0x0080 0x000001cb7376 > [A] > hdb: writing: LBAsect=30110710, sectors=128, buffer=0x00253000,This is bizarre. Someone has commented out the "#ifdef DEBUG" in xen/drivers/ide/ide-disk.c in several places. The strange thing is that the changelog suggest this was done 13 months ago! Why hasn''t anyone noticed before? We do most of our testing on SCSI, but there are *loads* of people using IDE in production environments. Surely this debug output hasn''t been coming out the whole time without anyone noticing? I suspect that something else must have been gating it until very recently, but I''m not sure what. I''ll investigate. In the meantime, remove the comments from ide-disk.c Thanks, Ian ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
> > > I''m trying to connect to a Xen (1.2) console via a terminal > > concentrator and, on boot, instead of getting console output > > I''m getting literally thousands of lines as follows: > > > > hdb: 0x0080 0x000001cb7376 > > [A] > > hdb: writing: LBAsect=30110710, sectors=128, buffer=0x00253000, > > This is bizarre. > > Someone has commented out the "#ifdef DEBUG" in > xen/drivers/ide/ide-disk.c in several places. > > The strange thing is that the changelog suggest this was done 13 > months ago! Why hasn''t anyone noticed before? > > We do most of our testing on SCSI, but there are *loads* of > people using IDE in production environments. Surely this debug > output hasn''t been coming out the whole time without anyone > noticing? I suspect that something else must have been gating it > until very recently, but I''m not sure what. I''ll investigate. > > In the meantime, remove the comments from ide-disk.cAmusing! The reason is that until recently we had not run Xen on a system with an IDE disc using "48-bit LBA mode". The older 28-bit LBA mode can address up to 137GB discs, but of course now 160GB is the "knee" of the price-capacity curve (which is where everyone buys their IDE discs). So we are just beginning to run Xen on discs of sufficient capacity to require LBA-48 addressing, which executes hardly-tested code paths in Xen. Debugging was never turned back off on those paths. :-) I''ll turn the debugging off... -- Keir ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel