Re: Troubles with em on FreeBSD 7

On Sun, May 4, 2008 at 3:07 PM, Oleksandr Samoylyk
<oleksandr@xxxxxxxxxxxxxxxx> wrote:
mike@xxxxxxxxxx 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
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