[CFT][PATCH] Netfront fixes for FreeBSD-head [and an OT issue]

Justin T. Gibbs gibbs at scsiguy.com
Thu Sep 15 13:01:46 UTC 2011

On 9/15/11 4:35 AM, Hugo Silva wrote:
> On 09/15/11 05:43, Janne Snabb wrote:
>> On Mon, 12 Sep 2011, Justin T. Gibbs wrote:
>>> I'm planning to ask RE for permission to merge the following netfront
>>> fixes (listed below) into 9.0/head.
> Assuming this is the same patch that I posted on the list after someone
> sent it to me, it seems to solve the problem (xn* works).

It is similar, but not identical.  If you have the resources to test my 
I would appreciate it.
> A major problem (and after the netdiff fix, the only one that comes to
> mind in FreeBSD/Xen, from a SA PoV) right now is the VMs losing massive
> amounts of time (just the other day I manually ran ntpdate, for a 1h
> adjustment); started a thread last week or so, but it died down.
> It may not happen 100% of the time (calcru: runtime went backwards +
> losing system time), as I remember that a couple of years ago several
> people on the list had this problem while I wasn't experiencing it.
> Perhaps it depends on the dom0 OS, some system hardware.. I really have
> no idea..
> If someone else is running amd64 HVM+PV, let us know if you see the same?
We run it at Spectra Logic.  I can replicate the "calcru: runtime went 
issue if I do not pin our FreeBSD VM such that it exclusively owns the CPUs
it uses.  I have not had time to dig into this yet, since it is not a 
blocking bug
for our product.  I hope to have some time to work on this in a few weeks.


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