On Wed, 3 Mar 1999, Mikhail Teterin wrote: > > > It has pretty horrible performance problems on 2.2.8-STABLE, even when > > > using DMA: > > > > [...] > > > 4.4%Sys 91.9%Intr 3.7%User 0.0%Nice 0.0%Idl 4244 inact 204 pci irq9 > > > | | | | | | | | | | 5288 cache 105 aic0 irq11 > > > ==++++++++++++++++++++++++++++++++++++++++++++++ 248 free 104 wdc0 irq14 > > > [...] > > > I would not use this type of card for disk if I could avoid it, and > > probably not for tape either, I have a scanner I plan to use with it. > > Yes, tape is the only target on this bus here... From reading the 2.2.8's > driver's source I see the DMA is not "yet supported", although the card > supports it and lets me choose the drq. Still, the amount of CPU it takes > to process an interrupt (CyrixInstead 8x86 at over 200MHz) does not look > right.... > Unless it is a really slow tape drive, I'd get a better adapter. In any case, As I said much of the protocol must be implemented by the CPU, most of this happens in the interrupt routine.
Brian Beattie | The only problem with beat...@aracnet.com | winning the rat race ... www.aracnet.com/~beattie | in the end you're still a rat To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-current" in the body of the message
