On Fri, Feb 08, 2019 at 08:23:55PM -0500, Brad Smith wrote: > On 2/8/2019 8:07 PM, Sijmen J. Mulder wrote: > > > Hi, > > > > I run OpenBSD (snapshots) in a KVM+QEMU VM on Debian 9 and use it over > > SSH. Those SSH sessions stall almost without fail when there's a lot of > > output. > > > > Repro (or at least my set up): > > > > 1. Create a KVM+QMEU VM on Linux with virt-manager. I assigned two > > cores and otherwise used defaults. > > 2. Install an OpenBSD snapshot. > > 3. In an SSH session, execute 'find /' until hang. I suspect other > > large network transfers may result in the same. > > > > Symptoms: > > > > - SSH session stalls with no output, no echo, and no response to ^C. > > - New communication (SSH, ping) cannot be established: "no route to > > host" > > - The serial console outputs "re0: watchdog timeout" > > - From the serial code, pinging the host yields "ping: sendmsg: No > > buffer space available" > > > > Workaround: > > > > 'ifconfig re0 down; ifconfig re0 up' and a little patience fixes it. > > > > Below, the VM's dmesg and its libvirt XML dump. After seeing the NFS > > messages I unmounted the shares but the behaviour was the same. > > > > Sijmen > > Why rtl8139? It's the worst option available to KVM/QEMU. You would be much > better off with virtio or e1000 for the NIC.
Change also the disk to 'virtio' instead of 'ide'. -- Juan Francisco Cantero Hurtado http://juanfra.info
