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Date: Mon, 25 Oct 2004 20:06:25 +0200
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Subject: Re: FreeBSD 5.3b7and poor ata performance
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S=F8ren Schmidt wrote:
>>>
>>> please can you post how do you solved the problem?
>>
>>
>> atacontrol mode <channel> DMA4 DMA4
>> atacontrol mode <channel2> DMA4 DMA4
>>
>> The reason is that the motherboard only supports ATA100 on two out of =

>> four IDE channels and hence you need to force the two other channels=20
>> to run at DMA66=20
>=20
>=20
> How do you come to that conclusion ? There is no such limitation AFAIK.=

>=20
> However you can only get a total sum of 133MB/s divided by number of=20
> disks (and minus some overhead on older system there is typically=20
> 110MB/s effective bandwidth)..
>=20
> The real explanation is much more likely that the timing specs are=20
> marginal (overclocked ?) for the disks, which causes problems..


no, it is my home PC in which I work so it's important stability
(not overclocking) and disk redundancy (vinum, gmirror)

Also, there is an unresolvable question. Why two 52MB/s disks
in raid0 has a throughput of 40MB/s and for raid1 18MB/s??