The suspend2 discussion resumes [LWN.net]

The suspend2 discussion resumes

Posted May 1, 2007 9:13 UTC (Tue) by dlang (guest, #313)
In reply to: The suspend2 discussion resumes by k8to
Parent article: The suspend2 discussion resumes

with suspend to ram you don't have to copy anything. the ram where the data lives is where it's being suspended to

you are also forgetting how slow flash is, it fast compared to magnetic media, but as far as memory types go it's one of the slowest available.

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hardware speed

Posted May 4, 2007 21:41 UTC (Fri) by anton (subscriber, #25547) [Link]

you are also forgetting how slow flash is, it fast compared to magnetic media

The seek time of flash is fast compared to disks, but the bandwidth of flash drives is usually lower. And a well-designed suspend-to-disk should dump and restore memory as one big extent on disk, so seeks should not play a role. Therefore I would expect flash to be slower than hard disks for this application.

Just to give you some numbers: A modern disk drive has a raw bandwidth of 70MB/s, a fast USB flash stick has 30MB/s, and the fastest CompactFlash cards have 40MB/s, but most are far slower (mine is 3MB/s).