Hi David, Am 07.04.2015 um 10:43 schrieb Dr. David Alan Gilbert: >>>> Any particular workload or reproducer? >>> Workload is almost zero. I try to figure out if there is a way to trigger >>> it. >>> >>> Maybe playing a role: Machine type is -M pc1.2 and we set -kvmclock as >>> CPU flag since kvmclock seemed to be quite buggy in 2.6.16... >>> >>> Exact cmdline is: >>> /usr/bin/qemu-2.2.1 -enable-kvm -M pc-1.2 -nodefaults -netdev >>> type=tap,id=guest2,script=no,downscript=no,ifname=tap2 -device >>> e1000,netdev=guest2,mac=52:54:00:ff:00:65 -drive >>> format=raw,file=iscsi://172.21.200.53/iqn.2001-05.com.equallogic:4-52aed6-88a7e99a4-d9e00040fdc509a3-XXX-hd0/0,if=ide,cache=writeback,aio=native >>> -serial null -parallel null -m 1024 -smp 2,sockets=1,cores=2,threads=1 >>> -monitor tcp:0:4003,server,nowait -vnc :3 -qmp tcp:0:3003,server,nowait >>> -name 'XXX' -boot order=c,once=dc,menu=off -drive >>> index=2,media=cdrom,if=ide,cache=unsafe,aio=native,readonly=on -k de >>> -incoming tcp:0:5003 -pidfile /var/run/qemu/vm-146.pid -mem-path >>> /hugepages -mem-prealloc -rtc base=utc -usb -usbdevice tablet -no-hpet >>> -vga cirrus -cpu qemu64,-kvmclock >>> >>> Exact kernel is: >>> 2.6.16.46-0.12-smp (i think this is SLES10 or sth.) >>> >>> The machine does not hang. It seems just I/O is hanging. So you can type at >>> the console or ping the system, but no longer login. >>> >>> Thank you, >>> Peter >> Interesting observation: Migrating the vServer again seems to fix to problem >> (at least in one case I could test just now). >> >> 2.6.8-24-smp is also affected. > How often does it fail - you say 'sometimes' - is it a 1/10 or a 1/1000 ? Its more often than 1/10 I would say.
> > I'm not sure at what kernel version the switch is, but newer kernels use some > code shared with the newer SATA world (libata?) where as older kernels had > separate IDE code, so the behaviour of the two can be quite different. Thats a good point. I will check what the kernels have. I remember that there was sth like a problem with error handling in the old drivers? Paolo, you worked a lot on IDE lately. Do you remember? Thanks, Peter
