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From: "Richard Fish" <bigfish@××××××××××.org> |
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Subject: Re: [gentoo-user] SATA tuning ? |
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Date: Tue, 15 Aug 2006 10:32:17 -0700 |
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Hi Richard, |
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thank you for answering ! :) |
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|
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> On 8/15/06, Meino Christian Cramer <Meino.Cramer@×××.de> wrote: |
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> > Hi, |
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> > |
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> > since SATA does not support DMA I would be interested in other ways |
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> > to tune the SATA interface. |
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> |
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> Huh? SATA _does_ support DMA, and it is always enabled. |
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> |
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> > Does someone knows some working things to do for tuning the SATA |
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> > interface? |
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> |
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> If you have chosen the correct driver in the your kernel |
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> configuration, it is self-tuning. There is no more performance to be |
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> had generally. |
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> |
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> What problem are you trying to solve? What does "hdparm -Tt /dev/sda" |
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> actually report? |
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|
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I used the following: |
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|
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# |
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# Please see Documentation/ide.txt for help/info on IDE drives |
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# |
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# CONFIG_BLK_DEV_IDE_SATA is not set |
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... |
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# |
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# SCSI low-level drivers |
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# |
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... |
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CONFIG_SCSI_SATA=y |
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... |
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CONFIG_SCSI_SATA_VIA=y |
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|
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(scsi support is enabled also) |
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|
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Just as an info: lspci say: |
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|
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00:00.0 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge |
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00:00.1 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge |
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00:00.2 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge |
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00:00.3 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge |
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00:00.4 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge |
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00:00.7 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge |
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00:01.0 PCI bridge: VIA Technologies, Inc. VT8237 PCI bridge [K8T800/K8T890 South] |
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00:0a.0 Ethernet controller: Marvell Technology Group Ltd. 88E8001 Gigabit Ethernet Controller (rev 13) |
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00:0b.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 11) |
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00:0b.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11) |
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00:0c.0 Multimedia controller: Sigma Designs, Inc. REALmagic Hollywood Plus DVD Decoder (rev 02) |
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00:0d.0 SCSI storage controller: LSI Logic / Symbios Logic 53c875 (rev 03) |
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00:0f.0 RAID bus controller: VIA Technologies, Inc. VIA VT6420 SATA RAID Controller (rev 80) |
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00:0f.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) |
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00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) |
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00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) |
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00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) |
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00:10.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) |
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00:10.4 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 86) |
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00:11.0 ISA bridge: VIA Technologies, Inc. VT8237 ISA bridge [KT600/K8T800/K8T890 South] |
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00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 60) |
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00:11.6 Communication controller: VIA Technologies, Inc. AC'97 Modem Controller (rev 80) |
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00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration |
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00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map |
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00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller |
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00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control |
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01:00.0 VGA compatible controller: ATI Technologies Inc Radeon RV200 QW [Radeon 7500] |
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|
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hdparm reports on a system, where no other task is running: |
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|
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solfire:Mail/vim>sudo hdparm -tT /dev/sda |
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/dev/sda: |
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Timing cached reads: 2996 MB in 2.00 seconds = 1499.13 MB/sec |
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Timing buffered disk reads: 174 MB in 3.01 seconds = 57.79 MB/sec |
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which is slightly faster then my previous PATA setup. |
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BUT |
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WHen doing things, which mixes higher CPU-loads with massive hd |
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utilization, things are going slow (compilation of Blender for |
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example). |
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It /seems/, that SATA uses more of the CPU capacity than PATA. |
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I read the information about "SATA not DMA capable" in the Net. As I |
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said: Partly contradictionary.... |
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|
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And it seems that DMA is only possible with NCQ enabled, which is |
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currently (linux 2.6.17.8, vanilla) not the case with the kernel. |
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But as said before: This infos are all of "copy and paste" nature...I |
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have no way to proof them!!! Thats why I post my question... |
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> -Richard |
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> -- |
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> gentoo-user@g.o mailing list |
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> |
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|
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Keep hacking! |
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Meino |
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-- |
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