Date: Tue, 2 Mar 1999 03:22:29 -0800 From: "David O'Brien" <obrien@NUXI.com> To: Ruslan Ermilov <ru@ucb.crimea.ua> Cc: stable@FreeBSD.ORG Subject: Re: Tagged queueing Message-ID: <19990302032229.A27401@relay.nuxi.com> In-Reply-To: <19990222140147.A2015@ucb.crimea.ua>; from Ruslan Ermilov on Mon, Feb 22, 1999 at 02:01:47PM %2B0200 References: <19990219233927.A4953@ucb.crimea.ua> <199902201930.MAA13801@panzer.plutotech.com> <19990222140147.A2015@ucb.crimea.ua>
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On Mon, Feb 22, 1999 at 02:01:47PM +0200, Ruslan Ermilov wrote:
> > Andrew Gallatin reported that his western digital enterprise drives only
> > get 1.5MB/sec throughput with tagged queueing turned on, and 8MB/sec
> > throughput with tagged queueing turned off. Therefore, we have a quirk
> > entry in the transport layer that disables tagged queueing for those
> > drives.
..snip..
> Ken, will you revert your change in cam_xpt.c,v 1.11 for WD enterprise drives
> or should I open PR?
I agree that WD enterprise drives should have Tagged Queueing turned off
by default. I did extensive test on a Dell PII-300Mhz with 128meg RAM and:
FreeBSD 3.1-19990218-STABLE
ahc0: <Adaptec 2940 Ultra SCSI adapter> rev 0x00 int a irq 10 on pci0.13.0
ahc0: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs
cd0 at ahc0 bus 0 target 5 lun 0
da0 at ahc0 bus 0 target 0 lun 0
da0: <WDIGTL WDE4360-1807A3 1.80> Fixed Direct Access SCSI-2 device
da0: 20.0MB/s transfers (10.0MHz, offset 8, 16bit)
da0: 4095MB (8388314 512 byte sectors: 255H 63S/T 522C)
I only got decent performance with TQ=off and WCE=on:
noWCE 250 2115 13.3 1601 2.9 1802 4.7 9903 64.0 9908 15.7 152.0 2.6
withWCE 250 9719 61.0 9258 16.8 3274 8.4 9694 62.7 9898 15.8 153.6 2.6
With TQ=on, WCE didn't make much difference:
tag_64 250 2879 18.0 1866 3.1 2655 6.2 9774 63.3 9732 11.1 154.2 2.2
tag_60 250 3279 20.4 2218 3.7 2850 6.7 9688 62.7 9726 11.1 151.8 2.2
tag_54 250 3190 19.9 2199 3.6 2820 6.6 9564 61.9 9580 11.0 153.2 2.2
tag_48 250 2871 17.9 2345 3.9 2768 6.4 9700 62.7 9716 11.0 156.6 2.2
tag_40 250 3060 19.1 2062 3.4 2805 6.5 9688 62.6 9686 11.0 157.3 2.2
tag_32 250 3926 24.4 2021 3.4 2741 6.3 9552 61.8 9574 10.9 156.6 2.2
tag_24 250 3331 20.7 1953 3.2 2742 6.3 9709 63.0 9686 11.0 160.3 2.3
tag_16 250 3361 21.0 2445 4.1 2621 5.9 9697 62.7 9538 10.8 155.3 2.2
tag_8 250 3665 22.7 2741 5.0 2430 6.7 9691 62.8 9719 16.4 157.4 2.8
tag_6 250 4184 26.0 2373 4.2 2438 6.7 9688 62.8 9713 16.3 156.5 2.8
tag_4 250 3948 24.5 2953 5.4 2306 6.3 9706 63.2 9689 16.3 155.8 2.8
tag_2 250 2963 18.4 2466 4.4 2502 6.6 9718 63.0 9689 16.3 144.1 2.4
tag_0 250 2163 13.3 1560 2.6 2300 4.7 9029 58.2 8795 9.5 152.1 2.0
tag_64wce 250 2780 17.3 1810 3.1 2721 6.4 9885 63.9 9853 11.2 162.1 2.3
tag_60wce 250 2409 15.0 1962 3.3 2891 6.8 9868 63.9 9882 11.3 163.2 2.3
tag_54wce 250 2540 15.9 2023 3.4 2919 6.9 9837 63.8 9769 11.1 160.3 2.3
tag_48wce 250 2673 16.7 2056 3.5 2823 6.7 9875 64.0 9869 11.3 161.5 2.3
tag_40wce 250 2944 18.4 1754 2.9 2830 6.6 9868 63.9 9882 11.3 160.0 2.2
tag_32wce 250 2881 18.0 1849 3.1 2777 6.4 9834 63.7 9810 11.1 163.8 2.3
tag_24wce 250 2816 17.6 1705 2.9 2757 6.3 9872 64.0 9873 11.2 159.6 2.3
tag_16wce 250 2921 18.2 1808 3.0 2648 6.0 9878 64.0 9879 11.3 160.6 2.3
tag_8wce 250 3320 20.6 1946 3.6 2488 6.9 9749 63.3 9905 16.6 158.4 2.8
tag_6wce 250 3099 19.3 2947 5.4 2668 7.4 9881 64.2 9870 16.6 156.9 2.8
tag_4wce 250 3482 21.6 2620 4.8 2417 6.6 9853 64.0 9917 16.7 161.5 2.9
tag_2wce 250 3615 22.5 2860 5.2 2521 6.7 9673 62.9 9841 16.5 158.5 2.6
I'll provide my scripts to anyone that wants to test this on their WD
enterprise drives.
--
-- David (obrien@NUXI.com -or- obrien@FreeBSD.org)
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