On Sun, 8 Jan 2006 18:37:52 -0800, Jesse Brandeburg <[email protected]> wrote:
Added Willy to Cc: -- I see a problem with 2 e100 NICs' accounting
under 2.4.32... See near and of this report.
>> Are rx checksums not turned on in 2.6' e100 driver?
>> CPU is only pentium/mmx 233
>
>Hey Grant, to answer your question, checksums are not offloaded with
>the current e100 driver but that really shouldn't make that much of a
>difference. I'm actually going to go with interrupt load due to e100
>being at least related to the problem.
>
>The netdev-2.6 git tree currently has a driver that supports microcode
>loading for your rev 8 PRO/100 and that microcode may help your
>interrupt load due to e100. however, it may already be loading.
>Also, what do you have HZ set to? (250 is default in 2.6, 1000 in 2.4)
>so you could try running your 2.6 kernel with HZ=1000
>
>while you're running your test you could try (if you have sysstat)
>sar -I <e100 interrupt> 1 10
>
>or a simpler version, 10 loops of cat /proc/interrupts; sleep 1;
No sar, now I'm running a separate link from the other e100 eth1
from deltree to another box so measurement and test traffic are
separated. I do everything via ssh so I can copy/paste from
terminals ;)
This run is 2.6.15a, with 100Hz and voluntary preempt:
grant@deltree:~$ cat /proc/interrupts
CPU0
0: 106221 XT-PIC timer
1: 8 XT-PIC i8042
2: 0 XT-PIC cascade
3: 11443 XT-PIC eth2 <<== ADSL modem
8: 1 XT-PIC rtc
11: 20402 XT-PIC eth0 <<== localnet
12: 21860 XT-PIC eth1 <<== spare -> test
14: 3260 XT-PIC ide0
NMI: 0
ERR: 0
grant@deltree:~$
grant@deltree:~$ while true; do grep eth1 /proc/interrupts; sleep 1; done
12: 26357 XT-PIC eth1
12: 26357 XT-PIC eth1 \
12: 26573 XT-PIC eth1 |
12: 27039 XT-PIC eth1 > time grep -v 192\.168\. \
12: 27514 XT-PIC eth1 | /var/log/apache/access_log \
12: 28320 XT-PIC eth1 | | cut -c-96
12: 29090 XT-PIC eth1 | real 0m6.205s
12: 30017 XT-PIC eth1 | user 0m0.620s
12: 30434 XT-PIC eth1 / sys 0m0.730s
12: 30434 XT-PIC eth1
grant@deltree:~$ while true; do grep eth1 /proc/interrupts; sleep 1; done
12: 30650 XT-PIC eth1
12: 30651 XT-PIC eth1 \
12: 30657 XT-PIC eth1 |
12: 30661 XT-PIC eth1 > time cat /var/log/apache/access_log
12: 30936 XT-PIC eth1 | real 0m2.383s
12: 31343 XT-PIC eth1 | user 0m0.010s
12: 31593 XT-PIC eth1 / sys 0m0.480s
12: 31593 XT-PIC eth1
This run is 2.6.15b, with 1000Hz and voluntary preempt:
grant@deltree:~$ while true; do grep eth1 /proc/interrupts; sleep 1; done
12: 4386 XT-PIC eth1
12: 4386 XT-PIC eth1 \
12: 4427 XT-PIC eth1 |
12: 4904 XT-PIC eth1 > time grep -v 192\.168\. \
12: 5350 XT-PIC eth1 | /var/log/apache/access_log \
12: 6065 XT-PIC eth1 | | cut -c-96
12: 6906 XT-PIC eth1 | real 0m6.649s
12: 7693 XT-PIC eth1 | user 0m0.841s
12: 8450 XT-PIC eth1 / sys 0m1.047s
12: 8548 XT-PIC eth1
12: 8548 XT-PIC eth1
ran above a few times to gauge repeatability, variation ~200ms in real.
grant@deltree:~$ while true; do grep eth1 /proc/interrupts; sleep 1; done
12: 18347 XT-PIC eth1
12: 18348 XT-PIC eth1 \
12: 18417 XT-PIC eth1 |
12: 18794 XT-PIC eth1 > time cat /var/log/apache/access_log
12: 19181 XT-PIC eth1 | real 0m2.573s
12: 19283 XT-PIC eth1 / user 0m0.005s
12: 19284 XT-PIC eth1 sys 0m0.547s
No joy with 1000Hz, turn off preempt?
This run is 2.6.15c, with 1000Hz and no preempt:
grant@deltree:~$ while true; do grep eth1 /proc/interrupts; sleep 1; done
12: 4400 XT-PIC eth1
12: 4400 XT-PIC eth1 \
12: 4614 XT-PIC eth1 |
12: 5053 XT-PIC eth1 > time grep -v 192\.168\. \
12: 5495 XT-PIC eth1 | /var/log/apache/access_log \
12: 6686 XT-PIC eth1 | | cut -c-96
12: 7394 XT-PIC eth1 | real 0m6.696s
12: 8258 XT-PIC eth1 | user 0m0.841s
12: 8456 XT-PIC eth1 / sys 0m0.994s
12: 8457 XT-PIC eth1
12: 8457 XT-PIC eth1
grant@deltree:~$ while true; do grep eth1 /proc/interrupts; sleep 1; done
12: 8544 XT-PIC eth1 \
12: 8814 XT-PIC eth1 | time cat /var/log/apache/access_log
12: 9485 XT-PIC eth1 > real 0m2.511s
12: 9486 XT-PIC eth1 | user 0m0.004s
12: 9486 XT-PIC eth1 / sys 0m0.529s
Still no joy?
Confirm 2.4 timings, this is with 2.4.32-hf32.1:
grant@deltree:~$ while true; do egrep 'eth0|eth1' /proc/interrupts; sleep 1; done
11: 6744 XT-PIC eth0
12: 4 XT-PIC eth1
11: 6746 XT-PIC eth0 \
12: 4 XT-PIC eth1 |
11: 7178 XT-PIC eth0 > time grep -v 192\.168\. \
12: 4 XT-PIC eth1 | /var/log/apache/access_log \
11: 7552 XT-PIC eth0 | | cut -c-96
12: 4 XT-PIC eth1 / real 0m1.565s
11: 7554 XT-PIC eth0 user 0m0.510s
12: 4 XT-PIC eth1 sys 0m0.340s
grant@deltree:~$ while true; do egrep 'eth0|eth1' /proc/interrupts; sleep 1; done
11: 9136 XT-PIC eth0 \
12: 4 XT-PIC eth1 |
11: 9516 XT-PIC eth0 > time cat /var/log/apache/access_log
12: 4 XT-PIC eth1 | real 0m1.946s
11: 10146 XT-PIC eth0 | user 0m0.000s
12: 4 XT-PIC eth1 / sys 0m0.200s
11: 10321 XT-PIC eth0
12: 4 XT-PIC eth1
Odd, with 2.4, the two e100 NICs are not being accounted properly:
root@deltree:~# ifconfig
eth0 Link encap:Ethernet HWaddr 00:90:27:42:AA:77
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4840 errors:0 dropped:0 overruns:0 frame:0
TX packets:8825 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:341812 (333.8 Kb) TX bytes:9931009 (9.4 Mb)
Interrupt:11 Base address:0xdcc0 Memory:fd201000-fd201038
eth1 Link encap:Ethernet HWaddr 00:90:27:58:32:D4
inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:12 Base address:0xdc80 Memory:fd200000-fd200038
dmesg says:
Intel(R) PRO/100 Network Driver - version 2.3.43-k1
Copyright (c) 2004 Intel Corporation
e100: selftest OK.
e100: eth0: Intel(R) PRO/100 Network Connection
Hardware receive checksums enabled
cpu cycle saver enabled
e100: selftest OK.
e100: eth1: Intel(R) PRO/100 Network Connection
Hardware receive checksums enabled
cpu cycle saver enabled
smc-ultra.c:v2.02 2/3/98 Donald Becker ([email protected])
eth2: SMC Ultra at 0x280, 00 00 C0 5D 46 B5,assigned IRQ 3 memory 0xd0000-0xd3fff.
e100: eth0 NIC Link is Up 100 Mbps Full duplex
e100: eth1 NIC Link is Up 100 Mbps Full duplex
Cheers,
Grant.
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