On Monday, 19 July 1999 at 13:24:18 -0700, Julian Elischer wrote:
> Alex Povolotsky wrote:
>>
>> About a week ago, I've posted a message here and didn't got positive replies.
>>
>> The problem is:
>>
>> when I use soft-updates on IDE disks (disk on primary master, disk on
>> secondary master, CD on primary slave), any active disk-using program
>> (starting Netscape, starting EXMH) causes all other programs literally to stop
>> for several seconds (well, 20-30 seconds is quite often!). Turning
>> soft-updates off causes this nastiness to disappear, but also slows down
>> disk-active processess.
>
> I saw this behaviour before..
> It was with an IDE disk drive running in PIO mode
>
> turning on DMA mode for the disk fixed it.
> I have no idea as to what was goin wrong, however I
> suggest that you try a kernel from -current as there has been a lot of
> change in the areas that might cause this sort of thing.
FWIW, there's something funny in the timing of the IDE driver, even in
DMA mode. I find in Vinum that I don't get control back from the
driver strategy routine until the request has completed.
Greg
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