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Thread: Great little utility I found for setting PCI latency.

  1. #1
    R.I.P. 2018-07-16 RoundEye's Avatar
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    Great little utility I found for setting PCI latency.

    I was having stuttering problems with Half-Life 2, after updating the drivers, setting the game options ect., it was still there. I ran across THIS page looking for help.

    It talked about a PCI latency tool, that seemed to help, my video card was set at the max which was hogging up the bus too long. I lowered it from 255 to 32 and it seemed to help quite a bit. I uploaded it HERE, in case anybody wants to download it directly.

    Here's a little more info from RojackPot, if you need it.
    Common Options : 0 - 255

    Quick Review

    This BIOS feature controls how long a PCI device can hold the PCI bus before another takes over. The longer the latency, the longer the PCI device can retain control of the bus before handing it over to another PCI device.

    Normally, the PCI Latency Timer is set to 32 cycles. This means the active PCI device has to complete its transactions within 32 clock cycles or hand it over to the next PCI device.

    For better PCI performance, a longer latency should be used. Try increasing it to 64 cycles or even 128 cycles. The optimal value for every system is different. You should benchmark your PCI cards' performance after each change to determine the optimal PCI latency time for your system.

    Please note that a longer PCI latency isn't necessarily better. A long latency can also reduce performance as the other PCI devices queuing up may be stalled for too long. This is especially true with systems with many PCI devices or PCI devices that continuously write short bursts of data to the PCI bus. Such systems would work better with shorter PCI latencies as they allow rapid access to the PCI bus.

    In addition, some time-critical PCI devices may not agree with a long latency. Such devices require priority access to the PCI bus which may not be possible if the PCI bus is held up by another device for a long period. In such cases, it is recommended that you keep to the default PCI latency of 32 cycles.

  2. #2
    Senior Member Sid's Avatar
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    Downloaded... Thanks

  3. #3
    SG Enthusiast The Dude's Avatar
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    Quote Originally Posted by Sid
    Downloaded... Thanks

  4. #4
    Member HowlingPhoenix's Avatar
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    I've been using this for a couple weeks..I set mine to 64 and it works great.
    Specs:
    Windows XP Pro
    2.53 p4 @2.8
    Shuttle AV49N Motherboard
    Leadtek 6800/all pipes and shaders unlocked
    Audigy LS w/Creative 5400
    1 GB Mushkin pc3200 RAM
    8X Lite-On DVD Burner
    19" NEC fe990 Monitor

  5. #5
    Certified SG Addict Brent's Avatar
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    hrm

  6. #6
    R.I.P. 2018-07-16 RoundEye's Avatar
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    Quote Originally Posted by Brent
    hrm
    OK, all-mighty video god, what's that mean?

    :2cool:

  7. #7
    resident plumber Mark's Avatar
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    does this work on any chipset ?
    4930K@4.3~32GBGskill~asusX79deluxe~r9-280x~240GB-SSD-OS drive~500GB-SSD-scratch~240GB-SSD-thrash~2TB storage~Windows 7 pro
    *~ SG stats ~my stats

  8. #8
    Senior Member Sid's Avatar
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    Quote Originally Posted by RoundEye
    OK, all-mighty video god, what's that mean?

    :2cool:
    I thought he was the video pimp

  9. #9
    R.I.P. 2018-07-16 RoundEye's Avatar
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    Quote Originally Posted by Mark
    does this work on any chipset ?
    I think so.

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