Troubles with em on FreeBSD 7

[Jack Vogel]

On Sun, May 4, 2008 at 3:07 PM, Oleksandr Samoylyk
<oleksandr at samoylyk.sumy.ua> wrote:
> mike at sentex.net wrote:
>
> >
> > A new version of the em drivers went into the tree Friday.
> >
> >
> > > dev.em.0.%desc: Intel(R) PRO/1000 Network Connection Version - 6.7.3
> > >
> >
> > dev.em.0.%desc: Intel(R) PRO/1000 Network Connection 6.9.0
> > dev.em.0.%driver: em
> > dev.em.0.%location: slot=0 function=0
> > dev.em.0.%pnpinfo: vendor=0x8086 device=0x108c subvendor=0x15d9
> > subdevice=0x108c class=0x020000
> > dev.em.0.%parent: pci13
> > dev.em.0.debug: -1
> > dev.em.0.stats: -1
> > dev.em.0.rx_int_delay: 0
> > dev.em.0.tx_int_delay: 66
> > dev.em.0.rx_abs_int_delay: 66
> > dev.em.0.tx_abs_int_delay: 66
> > dev.em.0.rx_processing_limit: 100
> >
>
>  I tried both:
>
>  - new drivers: 6.9.0
>  - rx_processing_limit: 100
>
>  Result the same :(
>
>
>
> > Also, post some of the stats.  Do a sysctl -w dev.em.1.stats=1
> > to all of your em nics
> >
>
>  em0: Excessive collisions = 0
>  em0: Sequence errors = 0
>  em0: Defer count = 0
>  em0: Missed Packets = 434970
>  em0: Receive No Buffers = 290593
>  em0: Receive Length Errors = 0
>  em0: Receive errors = 0
>  em0: Crc errors = 0
>  em0: Alignment errors = 0
>  em0: Collision/Carrier extension errors = 0
>  em0: RX overruns = 2929
>  em0: watchdog timeouts = 0
>  em0: XON Rcvd = 0
>  em0: XON Xmtd = 0
>  em0: XOFF Rcvd = 0
>  em0: XOFF Xmtd = 0
>  em0: Good Packets Rcvd = 64182304
>  em0: Good Packets Xmtd = 84277659
>  em0: TSO Contexts Xmtd = 832
>  em0: TSO Contexts Failed = 0
>
>
>  em1: Excessive collisions = 0
>  em1: Sequence errors = 0
>  em1: Defer count = 0
>  em1: Missed Packets = 0
>  em1: Receive No Buffers = 0
>  em1: Receive Length Errors = 0
>  em1: Receive errors = 0
>  em1: Crc errors = 0
>  em1: Alignment errors = 0
>  em1: Collision/Carrier extension errors = 0
>  em1: RX overruns = 0
>  em1: watchdog timeouts = 0
>  em1: XON Rcvd = 0
>  em1: XON Xmtd = 0
>  em1: XOFF Rcvd = 0
>  em1: XOFF Xmtd = 0
>  em1: Good Packets Rcvd = 62431510
>  m1: Good Packets Xmtd = 55466567
>  em1: TSO Contexts Xmtd = 0
>
>  em1: TSO Contexts Failed = 0
>
>
> > And are you using gigabit or fastE. If fastE, try disabling TSO as
> > some people have said they have problems with it at 100Mb.
> >
>
>  I'm on GgE. Disabling TSO doesn't help as well.

You are running out of RX side resources, did you say this
was UDP? I'm guessing upping your mbuf pool at least, I
can't think of something in driver-wise that would help.

If you have this same load going into a different nic, or
different os (like say Linux) can it manage?

This will take some thought, I'm not sure off the top of
my head here.

Jack