Date: Mon, 25 Jan 2010 16:46:40 +0200 From: Alexander Motin <mav@FreeBSD.org> To: =?ISO-8859-1?Q?Kristian_Kr=E6mmer_Nielsen?= <freebsd@com.jkkn.dk> Cc: freebsd-stable@freebsd.org Subject: Re: ata driver downgrades transfer speed for Intel ICH5 SATA150 in RELENG_8 ? Message-ID: <4B5DAED0.4060704@FreeBSD.org> In-Reply-To: <1264378988.00211131.1264368602@10.7.7.3> References: <1264378988.00211131.1264368602@10.7.7.3>
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Kristian Krĉmmer Nielsen wrote: > I just updated my kernel from RELEASE_8_0 to RELENG_8 and by rutine I > compare my dmesg -a output to make sure everything still works as expected. > > I notices that the ata-driver suddently downgraded the speed of my Intel > ICH5 SATS150 from SATA150 til UDMA133 - and I am not allowed to change > it manually by using atacontrol. > > Can this have something to do with the recent rewrite of ata-sata.c ? > http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/ata/ata-sata.c.diff?r1=1.6.2.2;r2=1.6.2.3 > > Here is the dmesg output compared with RELEASE_8_0 to RELENG_8: > > ...cut out... > atapci1:<Intel ICH5 SATA150 controller> port > 0xec00-0xec07,0xe800-0xe803,0xe400-0xe407,0xe000-0xe003,0xdc00-0xdc0f > irq 18 at device 31.2 on pci0 > ...cut out... > -ad4: 305245MB<Seagate ST3320620AS 3.AAD> at ata2-master SATA150 > +ad4: 305245MB<Seagate ST3320620AS 3.AAD> at ata2-master UDMA133 > ...cut out... > -ad6: 305245MB<Seagate ST3320620AS 3.AAD> at ata3-master SATA150 > +ad6: 305245MB<Seagate ST3320620AS 3.AAD> at ata3-master UDMA133 It is only a cosmetic difference. There is no performance degradation. The reason of this, in inability of the controller driver to get SATA connection speed from this hardware. -- Alexander Motin
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