On Tue, Oct 09, 2012 at 03:50:18PM +0200, Manuel Bouyer wrote: > On Tue, Oct 09, 2012 at 01:36:07PM +0000, Manuel Bouyer wrote: > > [...] > > Log Message: > > Support transfers of up to MACHINE_MAXPHYS in all pciide variants, and ahci. > > wd(4) limits its maxphys depending on the drives's capability (64k sectors > > for LBA48, 256 sectors for LBA and 128 sectors for older devices). > > > > I assumed all pciide controllers could do MACHINE_MAXPHYS transfers, but > > this may not be true. The capabilities of each controller variants should be > > looked at more closely. > > transfers with dd on the raw character device works fine, but I get this > panic when booting multiuser, both with pciide and ahci controllers: > Starting ntpd. > panic: bad chunksize 139264, iochunk 524288, request size 139264
Hmmmmm. This will be an attempt to transfer an entire file -- 139264 will be the entire file size of something, probably an executable it's paging in. I saw this before -- I can't remember what caused it -- the "bad chunksize" is, I think, because it's not power-of-2. The cause will be in the UVM readahead code. I could swear I fixed at least one cause of this already. Thor
