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Make USB/SCSI delay to avoid timeouts?
from my original post:
> Is there a way to enforce a delay in probing USB or SCSI in NetBSD, to
> possibly avert timeouts/disconnects?
> In FreeBSD, there is a tunable loader parameter.
> In /boot/defaults/loader.conf, there is a line showing the default (FreeBSD)
> #kern.cam.scsi_delay="2000" # Delay (in ms) before probing SCSI
> Not many computer users actually have SCSI these days, but USB uses SCSI
> subsystem.
> This 2000 milliseconds can be set higher, like 13000, and has helped me in
> FreeBSD.
> How can I achieve this effect in NetBSD?
Manuel Bouyer responded:
> A better question would be: why is 2s not enough ?
How is that for an evasive answer?
Or is this a devious way of saying I should stick with FreeBSD and Linux?
There tends to be a little delay in recognizing a USB device, and keeping it up.
I notice that setting kern.cam.scsi.delay="13000" or whatever it is now seems
to prevent device timeouts on the Hiro H50191 wi-fi adapter in FreeBSD.
This device is not supported in NetBSD but works in FreeBSD 10.0-prerelease and
11-HEAD as device rsu; also seems to be supported in OpenBSD 5.4.
Tom
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