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LPC: Booting Linux in five secondsLPC: Booting Linux in five secondsPosted Sep 23, 2008 16:56 UTC (Tue) by s0f4r (subscriber, #52284)In reply to: LPC: Booting Linux in five seconds by flewellyn Parent article: LPC: Booting Linux in five seconds
Please follow this calculation:
Writing on cheap SSD's maxes out at maybe 10MB/sec max., reads at 30MB/sec max sustained. Suppose that you have a laptop with 512mb memory. It will take 51 seconds to suspend to disk. It will take 17 seconds to resume from disk.
suspend to disk is just not the answer :)
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LPC: Booting Linux in five seconds Posted Sep 23, 2008 17:05 UTC (Tue) by flewellyn (subscriber, #5047) [Link]
I wouldn't trust an SSD, especially not a cheap one, as a root disk.
Flash life Posted Sep 23, 2008 21:27 UTC (Tue) by man_ls (subscriber, #15091) [Link] Because of the limited number of rewrites? With 100,000 rewrites and if you suspend 10 times an hour, 8 hours a day your Eee will last 3.5 years. Add some wear levelling, 200,000 rewrites or a half-full memory and you can stop worrying.
Flash life Posted Sep 24, 2008 0:41 UTC (Wed) by flewellyn (subscriber, #5047) [Link]
Yeah, I'd heard that before, but Val Henson wrote a <a href="http://valhenson.livejournal.com/25228.html">blog entry</a> which made a strong counterargument.
Flash life Posted Sep 24, 2008 6:49 UTC (Wed) by man_ls (subscriber, #15091) [Link] Thanks for the link. It is not so convincing though: even without any wear levelling there is a big safety margin.But if flash memory life really worries you, you can buy an 8GB SD memory card for $20, stick it into your Eee and place the most frequently written-to filesystems (/var, swap) on it. If it ever goes wrong you just replace it (and maybe get a new one for free if inside the 5-year warranty). I have a similar setup and it works fine. Just be sure to buy a fast SD card or suspend will take a long time.
Flash life Posted Sep 25, 2008 1:59 UTC (Thu) by deleteme (guest, #49633) [Link]
I've been running on Compact Flash since 2005 works fine.
LPC: Booting Linux in five seconds Posted Sep 25, 2008 7:27 UTC (Thu) by NCunningham (guest, #6457) [Link]
You're not accounting for compression. Yes, swsusp doesn't do compression, but the other implementations do. You generally get about 50% compression, so half the times for reading and writing.
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