Date: Wed, 06 Feb 2002 20:18:05 -0800 From: Darren Pilgrim <dmp@pantherdragon.org> To: freebsd-questions@freebsd.org Subject: dc NIC stalls, generating 35-40k+ interupts/sec? Message-ID: <3C61FFFD.D8C5679@pantherdragon.org>
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I'm trying to transfer a 1GB file over my network via FTP. The file is
1GB (2^30 bytes) dd'ed from /dev/zero in 1024 blocks. The client on
another machine will start downloading, get about 10MB into the file,
then stall. "systat -vmstat 1" on the server will show 35-40k
interupts per second coming from IRQ 18 (named "mux"), resulting in a
very noticable slow down. TX underrun messages such as the following
will be logged:
Feb 6 19:44:51 spark /kernel: dc0: TX underrun -- increasing TX threshold
Feb 6 19:45:00 spark /kernel: dc0: TX underrun -- increasing TX threshold
The only things on IRQ 18 are an el-cheapo NIC (dc0) and a HPT366 ATA
controller (ata2 and ata3). All disks are idle when this occurs,
despite the "in progress" transfer. The high rate of interupts will
continue even if I kill the FTP daemon and/or the client. When I down
dc0, however, the interupts on mux will return to idle/normal and
everything is fine again, until I try the transfer again. This is
reliably reproducable on my box (it happens every time I try to FTP
that file). I haven't tried unplugging the cable, or sending other
traffic to/from the box. Relevant info from dmesg:
FreeBSD 4.2-RELEASE #3: Thu Dec 13 17:28:48 PST 2001
root@spark.techno.pagans:/usr/src/sys/compile/SPARK
Timecounter "i8254" frequency 1193182 Hz
CPU: Pentium II/Pentium II Xeon/Celeron (501.14-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x665 Stepping = 5
Features=0x183fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
real memory = 67108864 (65536K bytes)
avail memory = 62504960 (61040K bytes)
Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
FreeBSD/SMP: Multiprocessor motherboard
cpu0 (BSP): apic id: 0, version: 0x00040011, at 0xfee00000
cpu1 (AP): apic id: 1, version: 0x00040011, at 0xfee00000
io0 (APIC): apic id: 2, version: 0x00170011, at 0xfec00000
<...>
dc0: <ADMtek AN985 10/100BaseTX> port 0xc800-0xc8ff mem 0xe9102000-0xe91023ff irq 18 at device 11.0 on pci0
dc0: Ethernet address: 00:04:5a:59:7c:a8
miibus0: <MII bus> on dc0
ukphy0: <Generic IEEE 802.3u media interface> on miibus0
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
atapci1: <HighPoint HPT366 ATA66 controller> port 0xd800-0xd8ff,0xd400-0xd403,0xd000-0xd007 irq 18 at device 19.0 on pci0
ata2: at 0xd000 on atapci1
atapci2: <HighPoint HPT366 ATA66 controller> port 0xe400-0xe4ff,0xe000-0xe003,0xdc00-0xdc07 irq 18 at device 19.1 on pci0
ata3: at 0xdc00 on atapci2
Dual 500MHz Celerons on an Abit BP6 (440BX) mainboard. The device
description for dc0 is incorrect.
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