On Mon, 18 Jan 1999, Bruce Evans wrote: > New models of IBM IDE drives are fast enough to consume a significant > fraction (perhaps > 100%) of PIO mode 4 bandwidth (16.6 MB/s). Don't > use them without DMA. Don't use them without UltraDMA (33.3 MB/s) if > you want full performance.
I presume the last "don't" should have been a 'do', i.e. _do_ use them with UltraDMA if you want full performance...? Also, the controller their running off isn't _Any_ DMA capable, at a guess it's going to be PIO4 tops, in which case (and as EIDA/UltraDMA are mean't to be 'backwards' compatible) - does this point to a bug/problem with the wdc driver? (i.e. drive too fast = wdc interrupt timeouts?) -Kp To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-current" in the body of the message
