10G and socket alloc failure

[Jack Vogel]

On 7/19/07, Andre Oppermann <andre at freebsd.org> wrote:
> Jack Vogel wrote:
> > While testing out the ixgbe driver we've observed this failure in the stack
> > code, here is the info:
> >
> > The test engineer is using iperf, typically with 16 threads. If the
> > driver is using
> > either legacy or MSI interrupts we will see broken pipes, in dmesg its
> > due to sonewconn() failing in syncache_socket().
> >
> > Whats interesting is that when I have multiple RX queues configured and
> > using MSI/X this doesnt happen, at least not very often.
> >
> > It does not seem to hurt performance horribly, iperf just spawns another
> > thread, but I was wondering if there is some underlying tuneable I dont
> > know about that would stop this from happening??
> >
> > And any theory about why it doesnt happen with multiple queues?
>
> Do you see any messages in syslog regarding syncache?

Yes, the messages are what are emitted in the code i cited above,
I could get the dmesg output if that would provide any more help.
I figured the point at which it is failing is pretty specific and someone
might know just from that what it was :)

Jack