Hi!
I'm planning to deploy Intel-based fast ethernet NICs on a busy
router so I decided to try NAPI.
I grabbed eepro100-napi-020619.tar.gz from
ftp://robur.slu.se/pub/Linux/net-development/NAPI/
and applied eepro100-napi.patch from the archive.
The patch is pretty old and some hand-merging was required to
patch eepro100.c from 2.4.21-pre5. I'm attaching the resulting
diff to this message.
To test NAPI performance, I've blasted a stream of short packets
from another host using pktgen. The bad thing is that receiving host
stopped responding to packets immediately. The effect is 100%
reproducable, eventually it comes back though, black-out can last
from a second to several minutes. Here is what I was able to catch
after 'ethtool -s eth0 msglvl 0xfff':
Mar 18 22:39:18 intermap kernel: eth0: interrupt status=0x4050.
Mar 18 22:39:18 intermap kernel: switching to poll,status=4050
Mar 18 22:39:18 intermap kernel: eth0: exiting interrupt, status=0x4050.
Mar 18 22:39:18 intermap kernel: In speedo_poll().
Mar 18 22:39:18 intermap kernel: In speedo_rx().
Mar 18 22:39:18 intermap kernel: speedo_rx() status 0000a020 len 64.
Mar 18 22:39:18 intermap last message repeated 25 times
Mar 18 22:39:18 intermap kernel: In speedo_rx().
Mar 18 22:39:18 intermap kernel: speedo_rx() status 0000a020 len 64.
Mar 18 22:39:18 intermap kernel: In speedo_rx().
Mar 18 22:39:18 intermap kernel: speedo_rx() status 0000a020 len 64.
Mar 18 22:39:18 intermap kernel: In speedo_rx().
Mar 18 22:39:18 intermap kernel: speedo_rx() status 0000a020 len 64.
Mar 18 22:39:18 intermap kernel: eth0: interrupt status=0x4050.
Mar 18 22:39:18 intermap kernel: switching to poll,status=4050
Mar 18 22:39:18 intermap kernel: eth0: exiting interrupt, status=0x4050.
Mar 18 22:39:18 intermap kernel: done,received=29
Mar 18 22:39:18 intermap kernel: In speedo_poll().
Mar 18 22:39:18 intermap kernel: In speedo_rx().
Mar 18 22:39:18 intermap kernel: speedo_rx() status 0000a020 len 64.
Mar 18 22:39:18 intermap last message repeated 13 times
Mar 18 22:39:18 intermap kernel: not done,received=14
Mar 18 22:39:18 intermap kernel: In speedo_poll().
Mar 18 22:39:18 intermap kernel: In speedo_rx().
Mar 18 22:39:18 intermap kernel: speedo_rx() status 0000a020 len 64.
Mar 18 22:39:18 intermap last message repeated 63 times
Mar 18 22:39:18 intermap kernel: No resource,reset
Mar 18 22:39:18 intermap kernel: done,received=64
Mar 18 22:39:19 intermap kernel: eth0: Media control tick, status 0040.
Mar 18 22:39:23 intermap last message repeated 2 times
Mar 18 22:39:23 intermap kernel: eth0: interrupt status=0x2040.
Mar 18 22:39:23 intermap kernel: switching to poll,status=2040
Mar 18 22:39:23 intermap kernel: scavenge candidate 63 status 400ca000.
Mar 18 22:39:23 intermap kernel: eth0: interrupt status=0x0040.
Mar 18 22:39:23 intermap kernel: eth0: exiting interrupt, status=0x0040.
Mar 18 22:39:23 intermap kernel: In speedo_poll().
Mar 18 22:39:23 intermap kernel: In speedo_rx().
Mar 18 22:39:23 intermap kernel: No resource,reset
Mar 18 22:39:23 intermap kernel: received==0
Mar 18 22:39:23 intermap kernel: done,received=1
Mar 18 22:39:23 intermap kernel: eth0: interrupt status=0x4050.
Mar 18 22:39:23 intermap kernel: switching to poll,status=4050
Mar 18 22:39:23 intermap kernel: eth0: exiting interrupt, status=0x4050.
Mar 18 22:39:23 intermap kernel: In speedo_poll().
Mar 18 22:39:23 intermap kernel: In speedo_rx().
Mar 18 22:39:23 intermap kernel: speedo_rx() status 0000a020 len 64.
Mar 18 22:39:23 intermap kernel: done,received=1
Mar 18 22:39:23 intermap kernel: eth0: interrupt status=0x4050.
Mar 18 22:39:23 intermap kernel: switching to poll,status=4050
Mar 18 22:39:23 intermap kernel: eth0: exiting interrupt, status=0x4050.
Mar 18 22:39:23 intermap kernel: In speedo_poll().
Mar 18 22:39:23 intermap kernel: In speedo_rx().
Mar 18 22:39:23 intermap kernel: speedo_rx() status 0000a020 len 78.
Mar 18 22:39:23 intermap kernel: done,received=1
Mar 18 22:39:23 intermap kernel: eth0: interrupt status=0xa050.
Mar 18 22:39:23 intermap kernel: scavenge candidate 0 status 600ca000.
Mar 18 22:39:23 intermap kernel: eth0: interrupt status=0x0050.
Mar 18 22:39:23 intermap kernel: eth0: exiting interrupt, status=0x0050.
Notice three "eth0: Media control tick, status 0040." messages in a row,
this is precisely the black-out period. During normal activity,
it prints "eth0: Media control tick, status 0050." every 2 seconds.
Moreover, above are only "No resource,reset" messages that were
captured during test run.
This is lspci info about this NIC:
00:0f.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100]
(rev 08)
Subsystem: Intel Corp. EtherExpress PRO/100+ Management Adapter
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (2000ns min, 14000ns max), cache line size 08
Interrupt: pin A routed to IRQ 10
Region 0: Memory at d5500000 (32-bit, non-prefetchable)
[size=4K]
Region 1: I/O ports at c800 [size=64]
Region 2: Memory at d5400000 (32-bit, non-prefetchable)
[size=1M]
Expansion ROM at <unassigned> [disabled] [size=1M]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=2 PME-
Can anyone help me to make NAPI work? Does anyone even use NAPI
with eepro100, I guess not many people since the patch is pretty old
and I could not find it ported to 2.4.21-pre.
:wq
With best regards,
Vladimir Savkin.
This archive was generated by hypermail 2b29 : Sun Mar 23 2003 - 22:00:24 EST