 Too Much Uptime, when /proc/uptime wraps |
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 Oct 3 2005, 05:30 PM
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#1
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Group: Members Posts: 242 Joined: 31-March 04 Member No.: 2,592  |
Hey All,
I have two Zaurus's, a SL-6000 which I use as my PDA everywhere, and my old SL-5500, which spends most of its life on a shelf, turned on, and on my wireless network (a great thing to ping when I need to test the wireless network). So the SL-5500 has lots of uptime, since it is on 24x7. I have been monitoring the uptime, and it has been incrementing nicely. I thought it was doing pretty well after it passed 400 days of uptime. Imagine my surprise when I checked the uptime today to see that it is only 7 days of uptime! Checking the last log, it is clear that the SL-5500 hasn't rebooted since 9 April 2004, so something was off. Not the end of the world. I guess Sharp (or Embedix) wasn't planning on the Zaurus being "up" for so long. The little Linux box that could. Craig... |
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Oct 3 2005, 05:50 PM
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#2
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Group: Members Posts: 97 Joined: 15-December 04 Member No.: 5,933 |
QUOTE(cvmiller @ Oct 4 2005, 01:30 AM) Not the end of the world. I guess Sharp (or Embedix) wasn't planning on the Zaurus being "up" for so long. The little Linux box that could. I wouldn't blame them ... might it be the old 497 day bug?! My woody 2.4.18 kernel rolled its counter over after 497 days too. John |
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Oct 4 2005, 06:25 AM
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#3
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Group: Members Posts: 48 Joined: 3-February 04 From: Edinburgh, Scotland Member No.: 1,681 |
This is from memory so I may be wrong....
The internal uptime clock in 2.4 linux kernels is 100Hz (not MHz) so with a 32bit counter you can only measure 497 days before you get wrap around. On new kernels the internal clock is 1000Hz and you get a wrap around after 49.7 days. |
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Oct 5 2005, 05:52 PM
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#4
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Group: Members Posts: 242 Joined: 31-March 04 Member No.: 2,592 |
QUOTE(inode0 @ Oct 3 2005, 05:50 PM) I wouldn't blame them ... might it be the old 497 day bug?! My woody 2.4.18 kernel rolled its counter over after 497 days too. John  OK, I guess that make sense. I have a 2.6 machine, I'll have to see if it lasts longer than 45 days (I read that the /proc/uptime counter was increased to 64 bits in 2.6). Thanks, Craig... |
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Oct 5 2005, 05:56 PM
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#5
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Group: Members Posts: 97 Joined: 15-December 04 Member No.: 5,933 |
QUOTE(cvmiller @ Oct 6 2005, 01:52 AM) OK, I guess that make sense. I have a 2.6 machine, I'll have to see if it lasts longer than 45 days (I read that the /proc/uptime counter was increased to 64 bits in 2.6). It will last a lot longer than 45 days.  John |
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