Hello Mark, On Mon, Jan 12, 2015 at 12:32:41PM +0000, Mark Cave-Ayland wrote: > I've been spending time working on the SPARC64 emulation on QEMU and can > confirm that the latest QEMU 2.2 release is good enough boot, install > and run all of Debian squeeze/wheezy, NetBSD and OpenBSD in -nographic > mode. Work on Solaris is currently a slow on-going task, although > support could be completed sooner if interested parties wanted to > sponsor such work. > > Now I've had a couple of personal reports of QEMU users experiencing > hard lockups during periods of high I/O under Debian wheezy similar to > the thread at > http://comments.gmane.org/gmane.linux.debian.ports.sparc/16093 (QEMU > emulation is an approximation of the Ultra 5 machine) which makes me > believe that this could be a kernel bug.
on a Sun Enterprise 250 UP Machine I found my heavy IO issue (dd if=dev/zero of=/dev/sd<x> hangs the machine sooner or later) fixed in the Vanilla 3.17 Kernel - see my experiences on http://www.spinics.net/lists/sparclinux/msg13158.html. But later on a scsi issue stopped me with 3.18 Kernels: http://comments.gmane.org/gmane.linux.ports.sparc/20270 > Sadly as I struggle to reproduce this issue locally then it's almost > impossible for me to say whether this is something that affects all > SPARC64 kernels or just a specific hardware combination, but I'd be very > interested to hear back as to whether you also experience any lockups > during high I/O during your testing with more recent kernels > (particularly virtio seems to help trigger the issue under emulation). I never saw any output on the machines where I log the console on those heavy IO related hangups - nor was there anything in the log files after a reboot. With squeeze I havn't noticed lookups during long runtimes. No lookups on Sun SMP Machines running wheezy with 3.17.x kernels so far. Hope that helps, greetings Hermann -- Netzwerkadministration/Zentrale Dienste, Interdiziplinaeres Zentrum fuer wissenschaftliches Rechnen der Universitaet Heidelberg IWR; INF 368; 69120 Heidelberg; Tel: (06221)54-8236 Fax: -5224 Email: [email protected] -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: https://lists.debian.org/[email protected]
