how to set the cpu to pci latency to zero?

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how to set the cpu to pci latency to zero?

Post by Guest »

hello folks,

i am trying to solve the welllknown soundproblem on via mvp3 boards using a geforce graphic card and sound from a fortemadia fm801a. there is in interesting link at www.deinmeister.de where i found a way to use a little program setting the latency to zero - unfortunately winxp returns an error message like "error in directnt.sys". so sound distortions and/or no sound are still with me.

recently i disovered the holy programm of h.oda, actually i have still no idea how it works since i was to lazy or foolish enough to find the pcr file for the mvp3 chipset (i have got an epox mvp3c2). and clicking around changing values or letters simply crashes the mashine ... i do not have any idea of what i do.

my question is - is it possible to change the cpu to pci latency value to zero by wpcredit? if so, please let me know where to get the pcrfile and which number to change. i will try to post my offsets soon, maybe they could help you in any way.

thx so far.
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RE: how to set the cpu to pci latency to zero?

Post by Jim »

I can't answer your main question; - "Is it possible to change the CPU to PCI latency value to zero by way of WPCredit?" But I can tell you that you can download a good number of VIA Chipset PCR files if you look in the "Software and Tweaking" section of the forums here for a post titled "PCR File Downloads Here", and follow it to its end.

I can also tell you there is another post in the same section titled "WPCredit Operating Instructions" which tells you how to use WPCredit.
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Post by KachiWachi »

PCI Bus Control starts at offset 70h. Register descriptions can be found starting on page 29 of the chipset datasheet.

Thanks.
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Post by Guest »

thx so far,

downloaded the pcrfiles for mvp3/vp3 chipsets, and now - ignoring the "vendor/device ID differs" message, trying to set all offsets concerning pci and cpu to zero.
lol. the problem seems to be somewhere else. i keep navigating throgh the sea of solved problems in internet.

thx to jim, his post concerning the tweaks on a dfi helped a lot. to add a suggestion here - why dont turn the "MD to HD pop" to zero=normal? every wpcredit table posted here has got the 6c offset at 01. seems to be safer?


but another question about wpcredit - dont you guys think, we are just playing with numbers? i meen, did somebody tested the performance boost for example by stopping the time for a video decompression by virtualdub? hmm ...
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Post by Jim »

1) "MDE to HD pop" - Haven't tried that, or if I did, it resulted in a system crash; and I didn't try it again. Will try that when Superpuppy 3 is back up. Thanks.

2) Somewhere in those PCR Files you should be able to find a set that don't give you that message. As near as I can tell if you get that message it is the wrong PCR File for your board. I get the same message on my P5A-B boards; and the reason I think is because the PCR File was created for a P5A board.

3) Having just checked the download counts on the PCR Files that I posted, I think you may have downloaded the Intel PCR Files by mistake instead of the VIA PCR Files, (which are what is required by an MVP3 board.) Anyway the Intel download is the only one that the download count has changed on in the last few days.
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Post by KachiWachi »

What is the exact warning/error message you receive?

By convention, a PCR file is named for the item it represents...such as 11060691.PCR (VIA Apollo Pro133A).

When you open the file as text, you will see something like this -

Code: Select all

PCR(PCI Configration Registers) Editor / WPCREDIT for WIN32
Copyright (c) 1998  H.Oda!

[COMMENT]=author KachiWachi
[MODEL]=Apollo Pro133A
[VID]=1106:VIA
[DID]=0691:Host to PCI bridge

(00)=vendor identification     xx06h: VIA Technologies
(01)=vendor identification     11xxh: VIA Technologies
(02)=device identification     xx91h: VT82C694X
(03)=device identification     06xxh: VT82C694X
WPCREDIT is matching the above text to what is being read in chipset registers 00-03h. If these do not match, you will get a warning message. If you are SURE you are running the correct file, just edit these lines to match...and the warning will go away. The [VID] and [DID] lines are for title purposes only, but they should match nonetheless.
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Post by Jim »

He is getting exactly the same message that I get on my P5A-Bs. Which we covered before in another thread. In his case, I think it is because he downloaded the Intel PCR Files by mistake. Reason being, for the last week or so the download count was VIA = 26; Intel = 23;. ALi = 17. Now it is VIA = 26; Intel = 24; ALi = 17.
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Post by KachiWachi »

Which file gives the error?

(Just downloaded all 3 sets.)
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Post by Jim »

He said he had been too lazy to go hunting for PCR file downloads, so I directed him to my post containing them. I don't know which file he is using. All I know is that only the Intel files had been downloaded in the timeframe he has been here.

He also said he got an error message : "vendor/device ID differs" which is just a less precisely stated version of the actual message we both are getting. With my ASUS P5A-B boards, I got the same error message he gets when I used the "10b91541.pcr" file. What I get is a popup screen with "Yes" and "No" buttons, showing : "Vendor I.D. / Device I.D. differs !! Does it continue?" I have not attempted to go beyond that point; and as a result have never used WPCredit on my ASUS boards.

I think in his case it may be because he is trying to use an intel PCR File on a VIA board; and in my case, because the PCR Files for the ALi chipset were written for a P5A board as opposed to a P5A-B board. Stedman 5040, who uses a P5A, does not get that message; but the reserved settings for his board are different from those for mine.
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Post by KachiWachi »

The only difference between the two boards is that the P5A-B supports the Baby AT form factor.

Both the P5A and the P5A-B use the same ALi Aladdin V (M1541) Northbridge.

When I opened your 10B91541.PCR file using Notepad, it was not in the "plain text" format. When I opened it using MS WORD (renamed the file to .doc), it displayed correctly. I then saved it as "text only". This enabled Notepad to correctly open the file.

Perhaps this is why you get the warning message and Stedman5040 does not.
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Post by Jim »

You could be right. I don't know. Just know I always got a warning message w/ it and hence never used WPCredit w/ it. I will experiment w/ that myself. It would seem to indicate that the files in my download should be replaced w/ corrected versions.

EDIT : I just tried to do what you said to do; but the results are as follows :

1) Open the file w/ notepad, and you get a mess with "signs" in it indicating where lines should break; but they don't.

2) Open the file w/ wordpad; and it displays properly.

3) Open the file w/ wordpad and save it as text; and it changes the file extension to "txt".

4) Take that resulting "txt" file and rename it as a "pcr" file; and the file no longer opens.

5) Delete all of them and re-extract the original files from the "RARfile"; and you are back where you started.

6) I do not see displayed the option to save the file as "text only".
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Post by KachiWachi »

Here...try this.
Attachments
10B91541.zip
(2.92 KiB) Downloaded 439 times
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PC #9 - ??? ;)
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Post by Jim »

Thanks; but that does not solve the problem of the other two files in that download. They are all like that. For future reference, would you mind explaining EXACTLY how you did that? -- it does display properly w/ notepad now.

EDIT : I did this yesterday, and did an edit then, but I guess it did not get submitted. In any case, I tried it again, experimenting by opening the file w/ wordpad, and saving it w/ each of the 5 options offered. Both "Rich Text"; and "Text" worked on the second attempt. Have replaced the files in the "ALi PCR Files.ZIP" with corrected versions.
Last edited by Jim on Sun Nov 05, 2006 7:17 am, edited 1 time in total.
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Post by KachiWachi »

The other two files open as text just fine here, though there is not much in them. I assume that the included RAR file is just a duplicate, so I didn't bother opening that.

As for my procedure, I already mentioned it.

I used MS WORD, not Wordpad. Wordpad seems to display the "bad" file correctly. Nonetheless, the format is wrong. Save it using "Text Document - MS-DOS Format", then test with Notepad.

BTW...did the error message go away?
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PC #1 - DFI 586IPVG, K6-2/+ 450 (Cyrix MII 433), 128 MB EDO. BIOS patched by Jan Steunebrink.
PC #2 - Amptron PM-7900 (M520), i200 non-MMX, 128 MB EDO
PC #3 - HP8766C, PIII-667, 768 MB SDRAM
PC #4 - ASUS P3V4X, PIII-733, 256 MB SDRAM
PC #5 - Gateway 700X, P4-2.0 GHz, 768 MB PC800 RDRAM
PC #6 - COMPAQ Evo N1020v laptop, P4-2.4 GHz, 1 GB PC2700 DDR
PC #7 - Dell Dimension 4600i, P4-2.8 GHz, 512 MB PC2700 DDR
PC #8 - Acer EeePC netbook, Atom N270 @ 1.60 GHz, 1 GB RAM
PC #9 - ??? ;)
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Post by Jim »

See EDIT to my last post. I wound up trying all 5 save options, and found that both "Rict Text"; and "Text" would produce something that would open properly w/ Notepad. "Text Document - MS DOS format" produced a file that would open ok w/ Notepad; but it had a couple of lead in lines that were not displayed in your version, so I did not use that method.

Regards the error, don't know. That machine is down right now, and will be for a while. Awaiting the arrival of a new mobo for it; and then it will need a lot of work to bring it back up.

EDIT : Generally speaking, I have found "Rich Text" to be the best format to save text documents in. Why? - Because "Rich Text" documents can be opened by both "Wordpad" and "Notepad" under both Win98-SE and WinXP-Pro. That is not true of various other formats.

Question is : Will "Rich Text" PCR Files work ok?
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K6-3+ 450 ACZ (6x100)
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2x 80G Maxtor (7200) Ducted w/ 2x486 Fans Mount
52/24/52/16 LG CDR/RW/DVD
8/4/3/12/24/16/32 LG Super Multi
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CMD 649 IDE Controller
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