Tx FIFO Underrun ?

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Hi all, 

Is it possible to avoid Tx errors appearing below ?? It's quite
important since it corrupts frames holding UDP packets for a real-time
application. Even if 4 out of 153299 may seem acceptable, It wrecks the
whole thing !

eth2      Link encap:Ethernet  HWaddr 00:90:F4:02:12:BA
          inet addr:192.168.40.14  Bcast:192.168.40.255 
Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:136114 errors:0 dropped:0 overruns:0 frame:0
          TX packets:149786 errors:4 dropped:0 overruns:4 carrier:4
          collisions:0 txqueuelen:500
          Interrupt:25 Base address:0xe000

Inter-|   Receive                                                | 
Transmit
 face |bytes    packets errs drop fifo frame compressed
multicast|bytes    packets errs drop fifo colls carrier compressed
   lo:   53957     303    0    0    0     0          0         0   
53957     303    0    0    0     0       0          0
eth0:167967540  153343    0    0    0     0          0         0
140312149  143759   0    0    0     0       0          0
eth1:       0       0     0    0    0     0          0         0       
0       0    0    0    0     0       0          0
eth2:140064802  138935    0    0    0     0          0         0
167823196  153299   4    0    4     0       4          0

Corrupted frames are partially transmitted ( for example 1367 out of
1374 bytes are sent before truncation)

eth2 driver is 
#define DRV_NAME        "natsemi"
#define DRV_VERSION     "1.07+LK1.0.13"
#define DRV_RELDATE     "Oct 19, 2001"
in a 2.4.16 ppc kernel

Fabien
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