em driver input errors

[Mike Tancsa]

At 05:42 PM 9/8/2009, Barney Cordoba wrote:
>Manish What specific kinds of input errors are you getting? How many 
>PPS are you doing, what is the size of the ring, and the interrupt 
>modulation rate? Are the NICs PCIe or PCIx? Barney

In my case, our backup server (mix of dump via nfs and some dumps 
through ssh as well as writes via samba mounts) has a fairly low pps 
rate and starts to see input errors at about 100Mb.  Adding

hw.em.rxd=4096
hw.em.txd=4096

and

net.inet.tcp.recvbuf_max=16777216
net.inet.tcp.recvspace=131072
net.inet.tcp.sendbuf_max=16777216
net.inet.tcp.sendspace=131072
net.inet.udp.recvspace=65536
kern.ipc.somaxconn=1024
kern.ipc.maxsockbuf=4194304
net.inet.ip.redirect=0
net.inet.ip.intr_queue_maxlen=4096
net.route.netisr_maxqlen=1024
kern.ipc.nmbclusters=655360

didnt seem to make a difference in the amount of errors I was seeing


em1 at pci0:7:5:0: class=0x020000 card=0x348f8086 chip=0x10768086 
rev=0x05 hdr=0x00
     vendor     = 'Intel Corporation'
     device     = 'Gigabit Ethernet Controller (82541EI)'
     class      = network
     subclass   = ethernet
     cap 01[dc] = powerspec 2  supports D0 D3  current D0
     cap 07[e4] = PCI-X supports 2048 burst read, 1 split transaction

  Core(TM)2 Quad CPU    Q6600  @ 2.40GHz, AMD64, RELENG_7 from Jun 18th

Plenty of disk IO left and the CPUs doent seem to be taxed that much.

Sep  8 00:02:01 backup3 kernel: em1: Excessive collisions = 0
Sep  8 00:02:01 backup3 kernel: em1: Sequence errors = 0
Sep  8 00:02:01 backup3 kernel: em1: Defer count = 0
Sep  8 00:02:01 backup3 kernel: em1: Missed Packets = 61316
Sep  8 00:02:01 backup3 kernel: em1: Receive No Buffers = 0
Sep  8 00:02:01 backup3 kernel: em1: Receive Length Errors = 0
Sep  8 00:02:01 backup3 kernel: em1: Receive errors = 0
Sep  8 00:02:01 backup3 kernel: em1: Crc errors = 0
Sep  8 00:02:01 backup3 kernel: em1: Alignment errors = 0
Sep  8 00:02:01 backup3 kernel: em1: Collision/Carrier extension errors = 0
Sep  8 00:02:01 backup3 kernel: em1: RX overruns = 22397
Sep  8 00:02:01 backup3 kernel: em1: watchdog timeouts = 0
Sep  8 00:02:01 backup3 kernel: em1: RX MSIX IRQ = 0 TX MSIX IRQ = 0 
LINK MSIX IRQ = 0
Sep  8 00:02:01 backup3 kernel: em1: XON Rcvd = 0
Sep  8 00:02:01 backup3 kernel: em1: XON Xmtd = 0
Sep  8 00:02:01 backup3 kernel: em1: XOFF Rcvd = 0
Sep  8 00:02:01 backup3 kernel: em1: XOFF Xmtd = 0
Sep  8 00:02:01 backup3 kernel: em1: Good Packets Rcvd = 544276980
Sep  8 00:02:01 backup3 kernel: em1: Good Packets Xmtd = 490475071
Sep  8 00:02:01 backup3 kernel: em1: TSO Contexts Xmtd = 0
Sep  8 00:02:01 backup3 kernel: em1: TSO Contexts Failed = 0


pf is in the kernel as well

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Mike Tancsa,                                      tel +1 519 651 3400
Sentex Communications,                            mike at sentex.net
Providing Internet since 1994                    www.sentex.net
Cambridge, Ontario Canada                         www.sentex.net/mike