atom feed16 messages in org.freebsd.freebsd-stableRe: Dump takes ages on SCSI. (several...
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David GilbertJul 2, 2000 1:24 pm 
Kent StewartJul 2, 2000 2:53 pm 
David GilbertJul 2, 2000 5:42 pm 
Kent StewartJul 2, 2000 6:50 pm 
Chad R. LarsonJul 2, 2000 8:44 pm 
David GilbertJul 2, 2000 9:25 pm 
Kenneth D. MerryJul 2, 2000 10:55 pm 
David MaloneJul 3, 2000 12:01 am 
kostikJul 3, 2000 1:35 am 
Gerhard SittigJul 3, 2000 10:38 am 
Mike SmithJul 3, 2000 6:57 pm 
Mike SmithJul 4, 2000 4:08 am 
Mike SmithJul 4, 2000 5:22 am 
Gerhard SittigJul 4, 2000 10:16 am 
Mike SmithJul 6, 2000 2:36 am 
Don LewisJul 14, 2000 1:36 am 
Subject:Re: Dump takes ages on SCSI. (several times faster on IDE)
From:Mike Smith (msm@freebsd.org)
Date:Jul 4, 2000 4:08:25 am
List:org.freebsd.freebsd-stable

When the da(4) driver does a dump, it uses the CAM transport layer's polled completion/action facility, xpt_polled_action().

It looks like there is a substantial delay (1ms) in that routine between poll intervals.

That would still allow 4MB/sec (1 page per I/O) - I think there's more to it than just that.

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