Performanceproblem with IBM TKR under LINUX

I have an old PC (P166MHz, MB: ASUS TP4XE). Win98 and Redhat 7.3 is
installed. I inserted an IBM Turbo 16/4 ISA Tokenring Adapter. I
configured the adapter to AUTO16 (the only mode which is supported
under Linux). Under Win98 I have no problems. Under LINUX the
Transferrate is awful between 200-300kb. Further the card is dieing
sometimes. A ifconfig tr0 down/up cleans that situation. I replaced
the card but this didn't also solve the problem.
a listing from dmesg (incl. ifconfig down/up):

ibmtr.c: v1.3.57 8/ 7/94 Peter De Schrijver and Mark Swanson
v2.1.125 10/20/98 Paul Norton <(E-Mail Removed)>
v2.2.0 12/30/98 Joel Sloan <(E-Mail Removed)>
v2.2.1 02/08/00 Mike Sullivan <(E-Mail Removed)>
v2.2.2 07/27/00 Burt Silverman <(E-Mail Removed)>
v2.4.0 03/01/01 Mike Sullivan <(E-Mail Removed)>
tr0: ISA P&P Auto 16/4 Adapter found
tr0: using irq 11, PIOaddr a20, 8K shared RAM.
tr0: Hardware address : 00:04:AC:B2:CFE
tr0: Shared RAM paging disabled. ti->page_mask 0
tr0: Maximum Receive Internet Protocol MTU 16Mbps: 2008, 4Mbps: 2008
tr0: Initial interrupt : 16 Mbps, shared RAM base 000d8000.
tr0: Opening adapter: Xmit bfrs: 2 X 2048, Rcv bfrs: 2 X 1032
tr0: Adapter is up and running
tr0: ASB error 26 in cmd 0D
tr0: ASB not free !!!

tr0: Adapter is closed.

tr0: Initial interrupt : 16 Mbps, shared RAM base 000d8000.
tr0: Opening adapter: Xmit bfrs: 2 X 2048, Rcv bfrs: 2 X 1032
tr0: Adapter is up and running

I played with IRQs and RAM/ROM addresses -> no success.

Has someone any good idea?
greetings Robi