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mrhodes
Guru
Joined: 01 May 2002
Posts: 310
Location: Halifax, NS
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 Posted: Fri Nov 08, 2002 6:38 pm Post subject: IDE Bus speed, and the kernel |
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Hey everyone...
I have a quick question about the ide bus speed. When booting off the Livecd, I noticed that one of the messages says 'Assuming 33Mhz bus speed' It said that I can change that by including "idebus=xx" in the kernel options....
However, I'm not sure eactly what to put there.... is it the FSB it wants? if so, I guess I would add 'idebus=266' to the kernel line. Is this correct??
Thanks
Mike |
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AlterEgo
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Joined: 25 Apr 2002
Posts: 1619
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| Posted: Fri Nov 08, 2002 6:43 pm Post subject: |
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It's about yout PCI bus speed.
It's supposed to be 33 Mhz. So leave it (or seek the adventure) |
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mrhodes
Guru
Joined: 01 May 2002
Posts: 310
Location: Halifax, NS
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| Posted: Fri Nov 08, 2002 6:57 pm Post subject: |
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you sure it's that slow??? 33Mhz seems pretty slow.. I have a pretty fast computer, I don't think anything on my system is 33Mhz....
Isn't the Front Side Bus the same as the PCI bus...? I thought they were all the same...
Mike |
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AlterEgo
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Joined: 25 Apr 2002
Posts: 1619
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| Posted: Fri Nov 08, 2002 7:24 pm Post subject: |
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yes I'm 100% sure
PCI should be 33 Mhz; AGP 66 Mhz
FSB depends on your processor: 66/100/133 Mhz
mem: depends om mem: 66/100/133/166 (except RDRam)
(x86 only)
But feel free to try  |
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mrhodes
Guru
Joined: 01 May 2002
Posts: 310
Location: Halifax, NS
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| Posted: Fri Nov 08, 2002 7:39 pm Post subject: |
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Ok,
thanks for the help 
I'll leave it as is
Mike |
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maxmc
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Joined: 14 Oct 2002
Posts: 480
Location: Linköping, Sweden
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| Posted: Sat Nov 09, 2002 1:10 pm Post subject: |
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What?
I set mine to 66. I have 133Mhz buss on my system and I had
to pass 66 to the kernel since my disks where running slow when my motherboard wasn't supported.. now it is so I run 100Mhz on the harddrives. |
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aardvark
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Joined: 30 Jun 2002
Posts: 576
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| Posted: Sat Nov 09, 2002 2:36 pm Post subject: |
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| maxmc wrote: | What?
I set mine to 66. I have 133Mhz buss on my system and I had
to pass 66 to the kernel since my disks where running slow when my motherboard wasn't supported.. now it is so I run 100Mhz on the harddrives. |
Ahem , are you talking about the Mhz of the PCI bus or the speed (grade) of your IDE controller. Sure , your, ide may be 133(?), but that is not Mhz but Mbyte/sec. As most (modern) harddisks are a.t.m physically no faster than 45 MB/s in the case of sequential reading of data (when does that happen..). A ide transferrate of 66MB/s seems still enough.... Only if your harddisk has a very large buffer it may be useful for it to be able to empty it's buffer at a higher speed, say 133 MB/s, but situations where this will really help are rare.
BTW , afaik there is 66 Mhz PCI, but its quite special and the slots are different, and you're not likely to find it in normal desktop systems. |
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maxmc
Guru
Joined: 14 Oct 2002
Posts: 480
Location: Linköping, Sweden
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| Posted: Sun Nov 10, 2002 12:47 pm Post subject: |
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| aardvark wrote: |
Ahem , are you talking about the Mhz of the PCI bus or the speed (grade) of your IDE controller. Sure , your, ide may be 133(?), but that is not Mhz but Mbyte/sec. As most (modern) harddisks are a.t.m physically no faster than 45 MB/s in the case of sequential reading of data (when does that happen..). A ide transferrate of 66MB/s seems still enough.... Only if your harddisk has a very large buffer it may be useful for it to be able to empty it's buffer at a higher speed, say 133 MB/s, but situations where this will really help are rare.
BTW , afaik there is 66 Mhz PCI, but its quite special and the slots are different, and you're not likely to find it in normal desktop systems. |
Ok it might not be the same but it helped my HDD performance to set it to 66Mhz. And since nothing complains I might want to run it in 66Mhz...
I have one of the newset motherboards from Asus and they should support it. |
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col
l33t
Joined: 08 May 2002
Posts: 820
Location: Melbourne - Australia
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| Posted: Sun Nov 10, 2002 10:49 pm Post subject: |
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| only high end server type motherboards carry PCI 66 mhz slots....the slot & cards are different so unless you have these slots then you should leave it ar 33mhz. Generally pci devices can go a little higher (say 38mhz) but it is overclocking your pci devices & will end up causing problems. |
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