Messages in this thread | | | Date | Mon, 29 Dec 2003 18:03:36 -0800 | From | Mike Fedyk <> | Subject | Re: 2.6.0 performance problems |
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On Mon, Dec 29, 2003 at 08:49:07PM -0500, Thomas Molina wrote: > On Tue, 30 Dec 2003, Martin Schlemmer wrote: > > > > It's not uncommon for a laptop to have a hard disk which supports > > > higher DMA modes than what the IDE chipset supports. > > > My aging Intel 440BX based VAIO has a disk in the same configuration > > > as yours, supports udma4, but chipset only goes up to udma2. > > > > > > > Right, or as somebody else pointed out, it might not be a 80-pin cable. > > > > Lets rephrase - does it also run in udma2 mode with 2.4 ? And did > > you check readahead? In 2.6 it seems that a bigger value is better - > > I for instance have to set it to 8192 to have the same performance as > > in 2.4 ... > > 8192 will be my next test. I'm doing a compile at the moment. It runs in > udma2 under both 2.4 and 2.6. If I need an 80-pin cable then udma4 is not > possible for this system. If I read the following, it is only capable of > 66MHz anyway: > > 00:07.1 IDE interface: VIA Technologies, Inc. > VT82C586A/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE (rev 10) > (prog-if 8a [Master SecP PriP]) > Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- > ParErr- Stepping- SERR- FastB2B- > Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
66Mhz has nothing to do with the DMA factor (33, 66, 100, 133, etc.). That's talking about the PCI bus, and I doubt you have a 66Mhz bus in a laptop. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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