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Subject2.4.24 eth0: TX underrun, threshold adjusted.
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Replacing 2.4.23 with 2.4.24 went without any error I noticed.

After 8h uptime I have connected the first nfsroot client.

In the server host klog got 12 "eth0: TX underrun, threshold adjusted."
messages while the client started to mount the dirs.

etherwake uses obsolete (PF_INET,SOCK_PACKET)
IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:07:e9:12:49:34:08:00 SRC=0.0.0.0 DST=255.255.255.255 LEN=576 TOS=0x00 PREC=0x00 TTL=20 ID=0 PROTO=UDP SPT=68 DPT=67 LEN=556 IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:07:e9:12:49:34:08:00 SRC=0.0.0.0 DST=255.255.255.255 LEN=576 TOS=0x00 PREC=0x00 TTL=20 ID=1 PROTO=UDP SPT=68 DPT=67 LEN=556
IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:07:e9:12:49:34:08:00 SRC=0.0.0.0 DST=255.255.255.255 LEN=576 TOS=0x00 PREC=0x00 TTL=60 ID=0 PROTO=UDP SPT=68 DPT=67 LEN=556 IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:07:e9:12:49:34:08:00 SRC=0.0.0.0 DST=255.255.255.255 LEN=576 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=68 DPT=67 LEN=556
IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:07:e9:12:49:34:08:00 SRC=0.0.0.0 DST=255.255.255.255 LEN=576 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=68 DPT=67 LEN=556
eth0: TX underrun, threshold adjusted.
[10 times]
eth0: TX underrun, threshold adjusted.

Host bridge: Intel Corp. 82845G/GL [Brookdale-G]
P4-2.4GHz 512MB RAM
eth0 intel eepro100
eth1 onboard b44 (for pppoe)

Never noticed such problem with 2.4.23 or earlier kernels.

Just noticed, on the nfsroot client getting the same message 4 times.
There is only one eepro100:

Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 10)
Subsystem: Intel Corp.: Unknown device 0070
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 f7800000 (32-bit, non-prefetchable) [size=4K]
Region 1: I/O ports at d000 [size=64]
Region 2: Memory at f7000000 (32-bit, non-prefetchable) [size=128K]
Expansion ROM at <unassigned> [disabled] [size=64K]
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-

Additional debug infos available on request.

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