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More NIC related IRQ / Cpu Usage Problems
- To: misc_(_at_)_openbsd_(_dot_)_org
- Subject: More NIC related IRQ / Cpu Usage Problems
- From: matt <matt_(_at_)_scrapshells_(_dot_)_com>
- Date: Sat, 20 Nov 2004 14:38:42 -0500 (EST)
Hello,
There have been a number of posts recently about the CPU usage being
hogged by interrupts when a network card is under load. I am experiencing
this problem on a number of IBM/PC330 boxes being used as routers. Once
the network interface gets any kind of a load the cpu usage spikes up and
the box lags badly. It will start responding once the network load goes
away however.
While under load interrupt cpu usage goes around 65-90%
I have tried this on 3 different IBM/PC330 machines all almost identical
hardware. Originally I was using ethernet cards detected as dc. I read
the responses to similar posts saying that it would be better to try Intel
based cards detected as fxp. So I bought 3 new fxp cards and tried them
all.
fxp0 is using default media options
Here is the relevant info:
dmesg, ps waux, ifstat -b, iostat -c20, vmstat -c20
dmesg:
------
OpenBSD 3.6 (GENERIC) #59: Fri Sep 17 12:32:57 MDT 2004
deraadt_(_at_)_i386_(_dot_)_openbsd_(_dot_)_org:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Intel Pentium (P54C) ("GenuineIntel" 586-class) 133 MHz
cpu0: FPU,V86,DE,PSE,TSC,MSR,MCE,CX8
cpu0: F00F bug workaround installed
real mem = 66691072 (65128K)
avail mem = 53325824 (52076K)
using 839 buffers containing 3436544 bytes (3356K) of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(00) BIOS, date 05/29/96, BIOS32 rev. 0 @ 0xfd971
pcibios0 at bios0: rev 2.1 @ 0xf0000/0x10000
pcibios0: PCI BIOS has 6 Interrupt Routing table entries
pcibios0: PCI Interrupt Router at 000:01:0 ("Intel 82371SB ISA" rev 0x00)
pcibios0: PCI bus #0 is the last bus
bios0: ROM list: 0xc0000/0x8000 0xc8000/0x1800 0xc9800/0x1800
cpu0 at mainbus0
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82439HX" rev 0x01
pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x01
pciide0 at pci0 dev 1 function 1 "Intel 82371SB IDE" rev 0x00: DMA, channel 0 wired to compatibility, channel 1 wired to compatibility
wd0 at pciide0 channel 0 drive 0: <WDC AC21200H>
wd0: 16-sector PIO, LBA, 1222MB, 2503872 sectors
wd0(pciide0:0:0): using PIO mode 4, DMA mode 2
pciide0: channel 1 ignored (disabled)
uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: irq 15
usb0 at uhci0: USB revision 1.0
uhub0 at usb0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
fxp0 at pci0 dev 7 function 0 "Intel 82557" rev 0x10: irq 11, address 00:0e:0c:5e:c0:13
inphy0 at fxp0 phy 1: i82555 10/100 media interface, rev. 4
vga1 at pci0 dev 8 function 0 "S3 Trio32/64" rev 0x54
wsdisplay0 at vga1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
fxp1 at pci0 dev 11 function 0 "Intel 82557" rev 0x10: irq 10, address 00:0e:0c:5e:c5:00
inphy1 at fxp1 phy 1: i82555 10/100 media interface, rev. 4
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pmsi0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pmsi0 mux 0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
sysbeep0 at pcppi0
npx0 at isa0 port 0xf0/16: using exception 16
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
biomask e3fd netmask effd ttymask ffff
pctr: 586-class performance counters and user-level cycle counter enabled
dkcsum: wd0 matched BIOS disk 80
root on wd0a
rootdev=0x0 rrootdev=0x300 rawdev=0x302
ps waux:
--------
USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND
root 1 0.0 0.4 348 240 ?? Is 10:07AM 0:00.07 /sbin/init
root 18077 0.0 0.7 140 452 ?? Is 10:08AM 0:00.07 syslogd: [priv] (syslogd)
_syslogd 18411 0.0 0.7 164 468 ?? S 10:08AM 0:00.12 syslogd -a /var/empty/dev/log
root 21598 0.0 0.7 112 436 ?? Is 10:08AM 0:00.04 inetd
root 31736 0.0 1.5 304 960 ?? Is 10:08AM 0:01.15 /usr/sbin/sshd
root 4218 0.0 1.4 948 924 ?? Ss 10:08AM 0:01.11 sendmail: accepting connections (sendmail)
root 28987 0.0 0.8 272 544 ?? Ss 10:08AM 0:00.13 cron
root 27247 0.0 0.5 376 308 C0 Ss 10:08AM 0:00.62 -csh (csh)
root 3712 0.0 0.3 288 172 C0 ?+ 10:23AM 0:00.10 ps -waux
root 2257 0.0 0.7 80 476 C1 Is+ 10:08AM 0:00.04 /usr/libexec/getty Pc ttyC1
root 30904 0.0 0.7 88 476 C2 Is+ 10:08AM 0:00.04 /usr/libexec/getty Pc ttyC2
root 20080 0.0 0.7 92 472 C3 Is+ 10:08AM 0:00.04 /usr/libexec/getty Pc ttyC3
root 23111 0.0 0.8 68 484 C5 Is+ 10:08AM 0:00.04 /usr/libexec/getty Pc ttyC5
ifstat -b:
----------
bigbrother# ifstat -b
fxp0
Kbps in Kbps out
5106.34 5835.81
4739.40 5416.45
4667.05 5333.77
5248.18 5997.92
5054.99 5777.13
4889.13 5584.57
5397.04 6168.04
4306.92 4922.19
5128.88 5861.58
4848.94 5541.65
5067.83 5791.81
4464.68 5102.49
4602.37 5257.85
5357.92 6123.34
4972.80 5683.20
4837.92 5529.05
5293.93 6049.34
4898.07 5597.79
4405.40 5034.74
4424.88 5057.01
iostat -c20:
------------
cpu
us ni sy in id
1 0 1 49 49
0 0 0 73 27
0 0 0 78 22
0 0 0 74 26
0 0 0 78 22
0 0 0 75 25
1 0 7 70 21
1 0 0 76 23
0 0 0 71 29
0 0 0 80 20
0 0 0 90 10
1 0 0 70 29
0 0 0 68 32
0 0 0 80 20
1 0 1 70 29
0 0 0 66 34
2 0 0 62 37
1 0 0 75 24
0 0 0 85 15
0 0 1 88 11
vmstat -c20:
------------
procs memory page disks traps cpu
r b w avm fre flt re pi po fr sr wd0 fd0 int sys cs us sy id
0 0 0 4744 39796 36 0 0 0 0 0 2 0 8702 67 5 1 54 45
0 0 0 4744 39796 22 0 0 0 0 0 0 0 12596 53 2 0 76 24
0 0 0 4744 39796 7 0 0 0 0 0 0 0 13891 9 2 0 77 23
0 0 0 4744 39796 7 0 0 0 0 0 0 0 12023 9 2 0 74 26
0 0 0 4744 39796 11 0 0 0 0 0 0 0 11131 21 3 0 63 37
0 0 0 4744 39796 7 0 0 0 0 0 0 0 14719 9 2 0 82 18
0 0 0 4744 39796 7 0 0 0 0 0 0 0 13487 9 3 1 73 26
0 0 0 4744 39796 7 0 0 0 0 0 0 0 13785 9 2 0 76 24
0 0 0 4744 39796 7 0 0 0 0 0 0 0 13728 9 3 0 85 15
0 0 0 4744 39796 11 0 0 0 0 0 0 0 12366 21 3 0 78 22
0 0 0 4744 39796 7 0 0 0 0 0 0 0 13898 15 3 1 77 22
0 0 0 4744 39796 7 0 0 0 0 0 0 0 15096 9 2 0 79 21
0 0 0 4744 39796 7 0 0 0 0 0 0 0 11839 13 3 0 64 36
0 0 0 4744 39796 7 0 0 0 0 0 0 0 11575 9 2 0 71 29
0 0 0 4744 39796 11 0 0 0 0 0 0 0 13629 21 2 1 81 18
0 0 0 4744 39796 7 0 0 0 0 0 0 0 13493 9 3 0 82 18
0 0 0 4744 39796 7 0 0 0 0 0 0 0 11756 9 2 0 66 34
0 0 0 4744 39796 7 0 0 0 0 0 0 0 14048 9 4 0 76 24
0 0 0 4744 39796 7 0 0 0 0 0 0 0 12125 9 2 0 78 22
0 0 0 4744 39796 11 0 0 0 0 0 0 0 14247 21 2 0 84 16
Any ideas? I'm willing to test source patches.
Thanks,
-Matt-
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