Messages in this thread | | | Date | Wed, 04 Jun 2003 03:23:06 +0200 | From | Mauk van der Laan <> | Subject | Re: siimage slow on 2.4.21-rc6-ac2 |
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He is right. I did several tests and it is the max_kb setting that does it, not the fact that I programmed both disks. Sorry to have put you in the wrong direction.
By the way, the autodma code doesnt seem to do anything?
Mauk
Andre Hedrick wrote:
>NO, it is not irrelevant. > >Seagate and Silicon Image are the only two player (well intel now) who did >their own PHY. They did not use the Marvel pairs. > >It is a function of possible ECC on the wire and the relation to the >segments in the PIO or SG operations. It is a FIFO issue based on 512byte >boundaries being breached on corner cases. > >The data on the wire is in 8K units. > >It is a 7.5K + 0.5K corner case. > >max_kb_per_request:15 == 7.5K > >This prevents this corner case until I can code the proper special case SG >table. > >drive->id->hwconfig |= 0x6000; > >Is needed to fake the driver for device side cable detect. >There are several issues and I have not had time to keep up. > >I have to do other business ventures because being an independent >developer/contract no longer can pay the bills. More proof that free >drivers and free software still has a cost to somebody. > >Cheers, > >On 3 Jun 2003, Alan Cox wrote: > > > >>On Maw, 2003-06-03 at 23:48, Mauk van der Laan wrote: >> >> >>>He! I just did >>> >>># hdparm -d1 -X66 /dev/hdX >>># echo "max_kb_per_request:15" > /proc/.ide/hdX/settings >>> >>>on BOTH sata drives and everything works fine! >>>Is it possible that they influence each other? >>> >>> >>Not as I understand it, but this is rather useful information. The SI >>does have some ties for PIO mode but not UDMA clocking. This is most >>interesting information. >> >>The max_kb_per thing should be irrelevant btw. >> >>- >>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/ >> >> >> > >Andre Hedrick >LAD Storage Consulting Group > >- >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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