Adding Wei to the Cc list since he added the multiqueue functionality. On Mon, Jul 25, 2016 at 02:59:02PM +0100, Karl Pielorz wrote: > > --On 22 July 2016 13:55 +0200 Roger Pau Monné <roger....@citrix.com> wrote: > > > In my environment I've migrated a FreeBSD VM with 2 cpus for > 100 > > consecutive times without seeing any issues (or freezes), although this > > was with OSS Xen and without xe-guest-utilities. Karl, have you tested > > HEAD recently? > > Ok, I have tested this with r303286 - it seems to work OK. The hosts gain no > time that I can see while migrating, and NTP stays happy. > > I did get a panic after about 40 migrations - but that seems to be some > network issue or something... > > ('panic called with 0 available queues / dbt_trace_self_wrapper / vpanic / > kassert_panic / xn_txq_mq_start / ether_output / udp_send / sosend_dgram / > kern_sendit / sendit / sys_sendto / amd64_syscall / Xfast_syscall)
I haven't been able to reproduce this, but I think it's possible that if you migrate an active netfront xn_txq_mq_start might be called during the migration, just in the middle of the setup_device reconfiguation (while info->num_queues is 0). Wei, I think netif_disconnect_backend should set IFF_DRV_OACTIVE in order to notify the net subsystem that the queues are full, so no further calls to xn_txq_mq_start happen until the resume has finished, do you agree? Roger. _______________________________________________ firstname.lastname@example.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-xen To unsubscribe, send any mail to "freebsd-xen-unsubscr...@freebsd.org"