On Tue, 2003-11-18 at 03:32, Angelo Naselli wrote: > So there isn't any problem is it? > I saw this thing because of a system that seems to be > slower and with more hd access so i assumed the > message > > ide: Assuming 33MHz system bus speed for PIO modes; > override with idebus=xx > > as something wrong on my system.
No problem. You might try doing hdparm -m 32 to see if it speeds up disk access. But the reference to PIO mode would only affect you directly if you had some really old HDD's or CD drives on the box. The PIO IDE bus and the UDMA IDE bus are "different" (Although I don't have all of the details on the difference.) and you use one but not the other. james > > > > > --- James Sparenberg <[EMAIL PROTECTED]> wrote: > > On Mon, 2003-11-17 at 13:12, Angelo Naselli wrote: > > > Any idea? why 16 bit ? > > > > > > [EMAIL PROTECTED] angelo]# /sbin/hdparm -v /dev/hda > > > > > > /dev/hda: > > > multcount = 16 (on) > > > > This is what I think you are refering to. from the > > man page. > > > > -m Get/set sector count for multiple sector > > I/O on the drive. > > A setting of 0 disables this feature. Multiple > > sector mode > > (aka IDE Block Mode), is a feature of most > > modern IDE hard > > drives, permitting the transfer of multiple sectors > > per I/O > > interrupt, rather than the usual one sector per > > interrupt. > > When this feature is enabled, it typically reduces > > operating > > system overhead for disk I/O by 30-50%. On > > many > > systems, it also provides increased data throughput > > of > > anywhere from 5% to 50%. Some drives, however > > (most > > notably the WD Caviar series), seem to run slower > > with multiple mode > > enabled. Your mileage may vary. Most > > drives support the minimum settings of 2, 4, > > 8, or 16 > > (sectors). Larger settings may also be possible, > > depending > > on the drive. A setting of 16 or 32 seems optimal > > on many systems. > > Western Digital recommends lower settings of 4 to > > 8 on many of their drives, due tiny (32kB) > > drive buffers > > and non-optimized buffering algorithms. The -i > > flag can be > > used to find the maximum setting supported by > > an installed > > drive (look for MaxMultSect in the output). Some > > drives claim > > to support multiple mode, but lose data at > > some > > settings. Under rare circumstances, such failures > > can result > > in massive filesystem corruption. > > > > The 16 bit setting is a least common denominator. A > > good number of > > drives out there either can't do or if they do, have > > no gain going to 32 > > bit. 32 bit also increases the chance of data > > corruption on drives that > > are dicey. So MDK and others pic the method least > > likely to cause > > problems. 16bit. > > > > James > > > > > IO_support = 0 (default 16-bit) > > > unmaskirq = 0 (off) > > > using_dma = 1 (on) > > > keepsettings = 0 (off) > > > readonly = 0 (off) > > > readahead = 8 (on) > > > geometry = 9964/255/63, sectors = 160086528, > > start = 0 > > > [EMAIL PROTECTED] angelo]# dmesg > > > [...] > > > Serial driver version 5.05c (2001-07-08) with > > HUB-6 MANY_PORTS MULTIPORT > > > SHARE_I > > > RQ SERIAL_PCI ISAPNP enabled > > > ttyS00 at 0x03f8 (irq = 4) is a 16550A > > > ttyS01 at 0x02f8 (irq = 3) is a 16550A > > > RAMDISK driver initialized: 16 RAM disks of 32000K > > size 1024 blocksize > > > Uniform Multi-Platform E-IDE driver Revision: > > 7.00beta4-2.4 > > > ide: Assuming 33MHz system bus speed for PIO > > modes; override with idebus=xx > > > SIS5513: IDE controller at PCI slot 00:02.5 > > > SIS5513: chipset revision 208 > > > SIS5513: not 100% native mode: will probe irqs > > later > > > SIS5513: SiS735 ATA 100 (2nd gen) controller > > > ide0: BM-DMA at 0xff00-0xff07, BIOS settings: > > hda:DMA, hdb:DMA > > > ide1: BM-DMA at 0xff08-0xff0f, BIOS settings: > > hdc:DMA, hdd:DMA > > > hda: Maxtor 6Y080L0, ATA DISK drive > > > blk: queue c0181bc0, I/O limit 4095Mb (mask > > 0xffffffff) > > > hdc: SAMSUNG DVD-ROM SD-616Q, ATAPI CD/DVD-ROM > > drive > > > ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 > > > ide1 at 0x170-0x177,0x376 on irq 15 > > > hda: attached ide-disk driver. > > > hda: host protected area => 1 > > > hda: 160086528 sectors (81964 MB) w/2048KiB Cache, > > CHS=9964/255/63, UDMA(33) > > > Partition check: > > > /dev/ide/host0/bus0/target0/lun0: p1 p2 < p5 p6 > > p7 > > > > [...] > > > > > > > > > > > > > > > ______________________________________________________________________ > > > Want to buy your Pack or Services from > > MandrakeSoft? > > > Go to http://www.mandrakestore.com > > > > > > > Want to buy your Pack or Services from > MandrakeSoft? > > > > Go to http://www.mandrakestore.com > > > > > __________________________________ > Do you Yahoo!? > Protect your identity with Yahoo! Mail AddressGuard > http://antispam.yahoo.com/whatsnewfree > > > ______________________________________________________________________ > Want to buy your Pack or Services from MandrakeSoft? > Go to http://www.mandrakestore.com
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