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   comp.sys.ibm.ps2.hardware      Discussing IBM PS/2 hardware      42,985 messages   

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   Message 42,335 of 42,985   
   Christian Holzapfel to Wolfgang Gehl   
   Re: FDX? Re: IBM 10/100 Mbps Ethernet Ad   
   07 Dec 23 03:29:20   
   
   From: google@holzapfel.biz   
      
   Wolfgang Gehl schrieb am Mittwoch, 6. Dezember 2023 um 23:48:51 UTC+1:   
   > My guess is a timing problem in the PCI-to-MCA bridge. May I ask you for   
   > another test run? The PC 750 supports a PCI bus clock of 50MHz. I could   
   > imagine that the MCA bus would cope much better with this than with the   
   > 66MHz bus clock.   
      
   With a 50 MHz base clock instead of 66, the adapter tops out at ~6700 k/sec:   
      
   NETIO - Network Throughput Benchmark, Version 1.7   
   (C) 1997-1999 Kai Uwe Rommel   
      
   TCP/IP connection established.   
   1k packets: 	        5326 k/sec   
   2k packets: 	        6079 k/sec   
   4k packets: 	        6273 k/sec   
   8k packets: 	        6648 k/sec   
   16k packets: 	6755 k/sec   
   32k packets: 	6680 k/sec   
      
   I guess the PCI clock is always BaseClock/2 on my system.   
   Wish I had a datasheet for the PC 750 clock chip, IMI SC471...   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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