On 01/19/2011 03:29 PM, Maksim Rayskiy wrote:
A kernel modification might not even be needed. Have you tried simply issuing READ VERIFY via bsg, and not caring if it completes? bsg should be able to handle an app submitting a command, but never checking the 'done' list, right? A simple shell app could execute write(bsg_fd, ... SCSI READ VERIFY command ...) exit(0) to avoid waiting for READ VERIFY command completion, I would hope. JeffMy question was how to speed up system resume when he the spinup request is coming from sd_resume(). For shell method to work I would have to ignore this request entirely and do READ VERIFY when system is fully restored. Can it be done without kernel modification? Tejun mentioned using manage_start_stop flag but had some reservations against it.
Oh, if we're talking about sd_resume(), SCSI definitely has an internal mechanism to fire off a request, without blocking and waiting for a response. It does sound like a kernel modification, but it should be straightforward via existing APIs.
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