Date: Wed, 19 Aug 2009 14:45:08 -0700 (PDT) From: alexpalias-bsdnet@yahoo.com To: "H.Fazaeli" <fazaeli@sepehrs.com> Cc: freebsd-net@freebsd.org Subject: Re: em driver input errors Message-ID: <959379.51225.qm@web56407.mail.re3.yahoo.com> In-Reply-To: <4A8C15B7.5090404@sepehrs.com>
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--- On Wed, 8/19/09, H.Fazaeli <fazaeli@sepehrs.com> wrote:
> From: H.Fazaeli <fazaeli@sepehrs.com>
> Subject: Re: em driver input errors
> To: alexpalias-bsdnet@yahoo.com
> Cc: freebsd-net@freebsd.org
> Date: Wednesday, August 19, 2009, 6:09 PM
> Have you tries fixed speed/duplex?
Hello. Flow control is already disabled in the switch, and now I have configured fixed speed and duplex both on the switch and the network card.
# ifconfig em0
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
ether 00:xx:xx:xx:xx:xx
media: Ethernet 1000baseTX <full-duplex>
status: active
I will let you know if this fixes the problem; however, I seem to remember that speed/duplex problems usually result in lots of collisions and CRC errors, but I get very little of those (no collisions in fact):
# netstat -nI em0
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
em0 1500 <Link#1> 00:xx:xx:xx:xx:xx 10448059238 2746221 12382379424 0 0
Also:
r# sysctl dev.em.0.stats=1 ; dmesg | tail -21
dev.em.0.stats: -1 -> -1
em0: Excessive collisions = 0
em0: Sequence errors = 0
em0: Defer count = 0
em0: Missed Packets = 2746217
em0: Receive No Buffers = 4996579
em0: Receive Length Errors = 0
em0: Receive errors = 2
em0: Crc errors = 2
em0: Alignment errors = 0
em0: Collision/Carrier extension errors = 0
em0: RX overruns = 1134
em0: watchdog timeouts = 0
em0: RX MSIX IRQ = 0 TX MSIX IRQ = 0 LINK MSIX IRQ = 0
em0: XON Rcvd = 0
em0: XON Xmtd = 0
em0: XOFF Rcvd = 0
em0: XOFF Xmtd = 0
em0: Good Packets Rcvd = 10443504721
em0: Good Packets Xmtd = 12377389802
em0: TSO Contexts Xmtd = 0
em0: TSO Contexts Failed = 0
This seems to suggest that the number of errors seen in ifconfig is linked to the "missed packets" statistic that's produced by the sysctl. Note that there are only 2 CRC errors and 2 other errors; I can't see anything that corresponds to the "Receive no buffers" figure; are those packets dropped by the NIC itself?
Alex
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