Date: Wed, 08 Dec 2004 21:41:15 +0900 From: Rob <spamrefuse@yahoo.com> To: FreeBSD <freebsd-questions@freebsd.org> Subject: Re: Harddisk speed: PIO4 vs. UDMA66 controller ? Message-ID: <41B6F66B.9060708@yahoo.com> In-Reply-To: <41B6F1AE.3000906@yahoo.com> References: <41B6F1AE.3000906@yahoo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Rob wrote: > > Hi, > > > I have a PII PC running 5.3. The output of 'dmesg' has a line: > > atapci0: <VIA 82C596B UDMA66 controller> [...] at device 7.1 on pci0 > > And at the end, it says: > > ad0: 43979MB <IBM-DTLA-307045/TX6OA50C> [89355/16/63] at ata0-master PIO4 > acd0: CDROM <CRD-8520B/1.00> at ata1-master PIO4 > > The harddisk is very new and can do UDMA100. With a UDMA66 controller > I expect the harddisk to operate at least at 66 MB/sec. Any ideas why > the speed is only PIO4? I just realize that I have put in /boot/loader.conf: hw.ata.ata_dma="0" to prevent a WRITE_DMA panic at bootup. That's probably the reason why the harddisk speed is forced to PIO4, right? This 'WRITE_DMA' problem, is causing trouble on several other of my PCs here. This is quite a nuissance with 5.3 ! Rob.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?41B6F66B.9060708>