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Mike Hibbett



Joined: 02 Sep 2003
Posts: 88
Location: UK
Mike Hibbett
Well, I found the problem with the sis900 driver.

If you look in the source file sis900.inc, you will find these lines at the end of the transmit code:

;****make sure packet transmitted successfully****
mov esi,10
call delay_ms

There are your 10ms :o)

I cannot test removing or reducing this delay, but you might like to experiment yourself, until I hear back from the author.

Mike.
Post 01 Sep 2004, 11:20
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dvorakvik



Joined: 06 Feb 2004
Posts: 19
Location: Praha - Czech Republic - Europe
dvorakvik
Dear Mike,

many thanks for revisiting the SIS900.INC driver.

Commenting the lines 1034, 1035 etc
;****make sure packet transmitted successfully****
; mov esi,10
; call delay_ms

SOLVES THE SIS900.INC driver problem.

Now Realtek 8029, Realtek 8139 and SiS900 based drivers behaved similar. Time delay between two UDP packets cca 85 microseconds with MIKE.ASM test program. <For others see above for download>

Viktor
Post 01 Sep 2004, 13:13
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Matrix



Joined: 04 Sep 2004
Posts: 1171
Location: Overflow
Matrix
dvorakvik wrote:
Using 10 msec delay ebx = 1 function 5 int 0x40 solves the problem ...
Now I try to short this delay using my own RDTSC based delay loop.

Viktor

hey, how can u count on RDTSC? it is not present on 486 and oldre processors, and how do you determine the divisor? - the accurate cpu frequency, i give u an advise: use pit timer directly Smile
MATRIX
Post 07 Sep 2004, 23:50
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dvorakvik



Joined: 06 Feb 2004
Posts: 19
Location: Praha - Czech Republic - Europe
dvorakvik
Look at Intel HW manuals. Shortly newer processors all have RDTSC 64long binary couter, which counts CPU clock frequency RDTSC => EAX = LSB EDX => MSB.

This is the most precise timing at CPU.

Viktor
Post 08 Sep 2004, 18:20
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Matrix



Joined: 04 Sep 2004
Posts: 1171
Location: Overflow
Matrix
dvorakvik wrote:
Look at Intel HW manuals. Shortly newer processors all have RDTSC 64long binary couter, which counts CPU clock frequency RDTSC => EAX = LSB EDX => MSB.

This is the most precise timing at CPU.

Viktor


look at my other thread about timing
http://board.flatassembler.net/topic.php?t=2207

MATRIX
Post 08 Sep 2004, 23:59
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