Messages in this thread | | | Date | Mon, 8 May 2006 17:21:12 +0000 | From | Pavel Machek <> | Subject | Re: [PATCH 7/14] random: Remove SA_SAMPLE_RANDOM from network drivers |
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Hi!
> > What do other platforms without a TSC do? > > Using get_cycles() for /dev/random is new as of 2.6. Before that, we > were directly calling rdtsc on x86 alone. 10msec resolution is fine > for plenty of sources.
For what devices are timestamps still 'random/unobservable' in 10msec range?
Maybe keyboard... but no, keyboard has autorepeat and can be observed remotely with 10msec accuracy in many cases. (telnet to bbs?)
Disk requests take less than 10msec.
It is trivial to measure packets with 10msec accuracy.
Mouse will generate many events within 10msec when user actually uses it.
...so, what devices are still random with 10msec sampling? -- Thanks for all the (sleeping) penguins. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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