Date: Mon, 11 Apr 2005 10:43:53 +0200 (CEST) From: Simun Mikecin <simun.mikecin@logos.hr> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/79783: ata: hw.ata.atapi_dma=1 reduces HDD writing transfer rate Message-ID: <20050411084353.3D9E326D05D@mail.logos.hr> Resent-Message-ID: <200504110850.j3B8oMVE072397@freefall.freebsd.org>
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>Number: 79783 >Category: kern >Synopsis: ata: hw.ata.atapi_dma=1 reduces HDD writing transfer rate >Confidential: no >Severity: critical >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Apr 11 08:50:22 GMT 2005 >Closed-Date: >Last-Modified: >Originator: Simun Mikecin >Release: FreeBSD 5.4-STABLE i386 >Organization: >Environment: System: FreeBSD data.home.hr 5.4-STABLE FreeBSD 5.4-STABLE #0: Wed Apr 6 20:26:25 CEST 2005 root@data.home.hr:/var/obj/usr/src/sys/DATA i386 Reproduced on two machines both using 5.4-STABLE. Tried with GENERIC and custom kernel. #1) Laptop Toshiba Qosmio F10 (Centrino, Intel 855/ICH4 chipset) with: atapci0: <Intel ICH4 UDMA100 controller> port 0xbfa0-0xbfaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f77 irq 11 at device 31.1 on pci0 ad0: 57137MB <TOSHIBA MK6026GAX/PA203H> [116088/16/63] atata0-master UDMA100 acd0: DVDR <MATSHITADVD-RAM UJ-820S/1.00> at ata1-master UDMA33 #2) Pentium 4 desktop PC, Intel 875P/ICH5 chipset with: atapci0: <Intel ICH5 UDMA100 controller> port 0xf000-0xf00f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0 ad0: 176700MB <IC35L180AVV207-1/V26OA63A> [359010/16/63] at ata0-master UDMA100 acd0: DVDROM <Pioneer DVD-ROM ATAPIModel DVD-120S/1.01> at ata0-slave UDMA66 acd1: DVDR <PIONEER DVD-RW DVR-106D/1.07> at ata1-master UDMA33 >Description: When hw.ata.atapi_dma is set to 1, HDD writing transfer rate reduces to 16MB/s. Reading is not affected. Optical drives are not being used while testing. Using: sync && dd if=/dev/zero of=foo bs=1m count=100 results are: Machine #1) with hw.ata.atapi_dma=1: 104857600 bytes transferred in 6.521342 secs (16079144 bytes/sec) Machine #1) with hw.ata.atapi_dma=0: 104857600 bytes transferred in 3.586123 secs (29239823 bytes/sec) Machine #2) with hw.ata.atapi_dma=1: 104857600 bytes transferred in 6.532039 secs (16052813 bytes/sec) Machine #2) with hw.ata.atapi_dma=0: 104857600 bytes transferred in 2.160149 secs (48541835 bytes/sec) >How-To-Repeat: Try: sync && dd if=/dev/zero of=foo bs=1m count=100 >Fix: Set hw.ata.atapi_dma to 0. But that could break writing to optical media. >Release-Note: >Audit-Trail: >Unformatted:
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