* slow ZIP @ 2001-04-28 10:38 Giuliano Pochini 2001-05-01 20:32 ` Benjamin Herrenschmidt 0 siblings, 1 reply; 4+ messages in thread From: Giuliano Pochini @ 2001-04-28 10:38 UTC (permalink / raw) To: linuxppc-dev Why the ide ZIP drive is so slow ? Raw transfer speed is only 150KB/s, while it goes at ~1MB/s with MacOS. Bye. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: slow ZIP 2001-04-28 10:38 slow ZIP Giuliano Pochini @ 2001-05-01 20:32 ` Benjamin Herrenschmidt 2001-05-02 8:25 ` Giuliano Pochini 0 siblings, 1 reply; 4+ messages in thread From: Benjamin Herrenschmidt @ 2001-05-01 20:32 UTC (permalink / raw) To: Giuliano Pochini, linuxppc-dev >Why the ide ZIP drive is so slow ? Raw transfer speed is only 150KB/s, >while it goes at ~1MB/s with MacOS. I don't think we let it do DMA because of limitations of older drive models. If we had infos about how to differenciate DMA-capable ZIPs from those older ones, then we could enable DMA by default. Ben. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: slow ZIP 2001-05-01 20:32 ` Benjamin Herrenschmidt @ 2001-05-02 8:25 ` Giuliano Pochini 2001-05-02 11:32 ` Benjamin Herrenschmidt 0 siblings, 1 reply; 4+ messages in thread From: Giuliano Pochini @ 2001-05-02 8:25 UTC (permalink / raw) To: Benjamin Herrenschmidt; +Cc: linuxppc-dev >>Why the ide ZIP drive is so slow ? Raw transfer speed is only 150KB/s, >>while it goes at ~1MB/s with MacOS. > > I don't think we let it do DMA because of limitations of older drive > models. If we had infos about how to differenciate DMA-capable ZIPs > from those older ones, then we could enable DMA by default. Ok, but how can I enable DMA after boot ? hdparm refuses to do it. Bye. Giuliano Pochini ->)|(<- Shiny Network {AS6665} ->)|(<- ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: slow ZIP 2001-05-02 8:25 ` Giuliano Pochini @ 2001-05-02 11:32 ` Benjamin Herrenschmidt 0 siblings, 0 replies; 4+ messages in thread From: Benjamin Herrenschmidt @ 2001-05-02 11:32 UTC (permalink / raw) To: Giuliano Pochini, linuxppc-dev >Ok, but how can I enable DMA after boot ? hdparm refuses to do it. Look for the code in ide-pmac.c that skips enabling DMA when the device is an ide floppy. Ben. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2001-05-02 11:32 UTC | newest] Thread overview: 4+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2001-04-28 10:38 slow ZIP Giuliano Pochini 2001-05-01 20:32 ` Benjamin Herrenschmidt 2001-05-02 8:25 ` Giuliano Pochini 2001-05-02 11:32 ` Benjamin Herrenschmidt
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