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Old 04-27-05, 01:47 AM   #1
silentplummet
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Default PCI latency

It would be nice to see nvidia.ko stop adjusting my PCI bus latency, grabbing 95% of the bandwidth, thank you very much. Having to manually set this every time I start X is annoying.

It runs much smoother on my machine set at 20 instead of F8 anyway. The effect of PCI latency on the card's 2D performance can especially be seen in apps like firefox, when, say, scrolling down a webpage. (Edit: To say the least about its effect on the performance of all other processes running on the system, like sound, networking, disk I/O.)
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Old 04-27-05, 02:19 AM   #2
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Default Re: PCI latency

how do you set the PCI latency?
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[b]Linux localhost 2.6.11 #3 Sat Mar 19 14:50:03 EST 2005 i686 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux[/b][center]
[color=blue]EPoX 9NDA3+ Socket 939 nForce 3 Ultra[/color][b] * [/b][color=blue]2x 512MB Mushkin Dual Basic PC3200 (@ CAS 2.0-3-3-6 1T)[/color][b] * [/b][color=blue]"BFG" GeForce 6800 GT "OC" (@OEM 370/1000)[/color][b] * [/b][color=blue]LSI Logic Ultra 160 SCSI-3 Single Channel 64-Bit Controller[/color][b] * [/b][color=blue]Creative Labs Soundblaster Audigy[/color][b] * [/b][color=blue]Intel Pro 100 S Desktop adapter[/color][b] * [/b][color=blue]Seagate Cheetah 15k.3 18GiB 15K RPM Ultra 320[/color][b] * [/b][color=blue]Seagate Cheetah X15 36LP 18GiB 15K RPM Ultra 160[/color][b] * [/b][color=blue]Samsung Spinpoint 40GiB 5400 RPM ATA100[/color][b] * [/b][color=blue]Samsung 48X ATA33 CD-ROM.[/color][/center][indent]
[b]Kernel[/b]: Vanilla [url="http://frozenarctic.com/erek/SERENA.txt"][u]2.6.11[/u][/url].
[b]Settings[/b]: 4kB stacks, regparm, pre-emptive, deadline i/o scheduler, fast writes on, sideband addressing on.
[b]Video/Sound drivers[/b]: NVIDIA x86-1.0-7174 / ALSA 1.0.9_rc3[/indent]
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Old 04-27-05, 02:36 AM   #3
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Default Re: PCI latency

localhost # setpci -v -s '*:*' latency_timer
00:00.0:0d = 00
00:01.0:0d = 00
00:01.1:0d = 00
00:08.0:0d = 00
00:0b.0:0d = 10
00:0e.0:0d = 00
00:18.0:0d = 00
00:18.1:0d = 00
00:18.2:0d = 00
00:18.3:0d = 00
01:00.0:0d = f8
02:06.0:0d = 20
02:09.0:0d = 20
02:0a.0:0d = 20
02:0a.1:0d = 20
02:0a.2:0d = 20
02:0b.0:0d = 48
02:0b.1:0d = 48

localhost # setpci -v -s 01:00.0 latency_timer=20
01:00.0:0d 20



does changing this setting affect 3D Application performance at all?
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[b]Linux localhost 2.6.11 #3 Sat Mar 19 14:50:03 EST 2005 i686 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux[/b][center]
[color=blue]EPoX 9NDA3+ Socket 939 nForce 3 Ultra[/color][b] * [/b][color=blue]2x 512MB Mushkin Dual Basic PC3200 (@ CAS 2.0-3-3-6 1T)[/color][b] * [/b][color=blue]"BFG" GeForce 6800 GT "OC" (@OEM 370/1000)[/color][b] * [/b][color=blue]LSI Logic Ultra 160 SCSI-3 Single Channel 64-Bit Controller[/color][b] * [/b][color=blue]Creative Labs Soundblaster Audigy[/color][b] * [/b][color=blue]Intel Pro 100 S Desktop adapter[/color][b] * [/b][color=blue]Seagate Cheetah 15k.3 18GiB 15K RPM Ultra 320[/color][b] * [/b][color=blue]Seagate Cheetah X15 36LP 18GiB 15K RPM Ultra 160[/color][b] * [/b][color=blue]Samsung Spinpoint 40GiB 5400 RPM ATA100[/color][b] * [/b][color=blue]Samsung 48X ATA33 CD-ROM.[/color][/center][indent]
[b]Kernel[/b]: Vanilla [url="http://frozenarctic.com/erek/SERENA.txt"][u]2.6.11[/u][/url].
[b]Settings[/b]: 4kB stacks, regparm, pre-emptive, deadline i/o scheduler, fast writes on, sideband addressing on.
[b]Video/Sound drivers[/b]: NVIDIA x86-1.0-7174 / ALSA 1.0.9_rc3[/indent]
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Old 04-27-05, 10:50 AM   #4
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Default Re: PCI latency

will someone please respond to this? i really want to understand...
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[b]Linux localhost 2.6.11 #3 Sat Mar 19 14:50:03 EST 2005 i686 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux[/b][center]
[color=blue]EPoX 9NDA3+ Socket 939 nForce 3 Ultra[/color][b] * [/b][color=blue]2x 512MB Mushkin Dual Basic PC3200 (@ CAS 2.0-3-3-6 1T)[/color][b] * [/b][color=blue]"BFG" GeForce 6800 GT "OC" (@OEM 370/1000)[/color][b] * [/b][color=blue]LSI Logic Ultra 160 SCSI-3 Single Channel 64-Bit Controller[/color][b] * [/b][color=blue]Creative Labs Soundblaster Audigy[/color][b] * [/b][color=blue]Intel Pro 100 S Desktop adapter[/color][b] * [/b][color=blue]Seagate Cheetah 15k.3 18GiB 15K RPM Ultra 320[/color][b] * [/b][color=blue]Seagate Cheetah X15 36LP 18GiB 15K RPM Ultra 160[/color][b] * [/b][color=blue]Samsung Spinpoint 40GiB 5400 RPM ATA100[/color][b] * [/b][color=blue]Samsung 48X ATA33 CD-ROM.[/color][/center][indent]
[b]Kernel[/b]: Vanilla [url="http://frozenarctic.com/erek/SERENA.txt"][u]2.6.11[/u][/url].
[b]Settings[/b]: 4kB stacks, regparm, pre-emptive, deadline i/o scheduler, fast writes on, sideband addressing on.
[b]Video/Sound drivers[/b]: NVIDIA x86-1.0-7174 / ALSA 1.0.9_rc3[/indent]
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Old 04-27-05, 11:42 AM   #5
silentplummet
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Default Re: PCI latency

You can test for yourself whether it affects 3D application performance. Notice a difference? No? Great. No effect.

Counting FPS is stupid and pointless.

But you should notice an effect in your 2D GUI work if you have a lot of windows open, or especially a multi-head configuration. Depending on your sound setup, you should notice less audio dropouts (xruns if you're doing ALSA).
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