On 06/01/2012 11:52 AM, Alexey I. Froloff wrote:
On Fri, Jun 01, 2012 at 11:31:21AM -0400, Brian Wheeler wrote:
Well, since I'm probably going to turn it off, can someone give me a
good reason why it should be turned _on_ by default? For me, the
"Benefit to Fedora" bullets are not compelling.
One good reason is to separate /tmp from /. When choosing
between failed sort and failed passwd (or anything else, that
modifies files in /), both because of "No space left on device"
error I prefer failed sort and working passwd.
Wouldn't the things which modify important stuff in / be running as
root? If so, they'd get that 5% to play with. In any case, I see your
point. However, I can't say that it has happened to me since the days
of 32M roots :)
And tmpfs is faster than any other filesystem, and easily resized
both ways.
Not really, though. You have to muck with adding and removing swap
partitions if you have workload that is biggish. I keep a 2G swap on
all of my systems so /tmp as tmpfs is going to do poorly on them and
since the disk is pretty much allocated elsewhere I can't just move
files around to get more /tmp (or / if things are going wonky). How
would an upgrade deal with that situation? Its very much like the
traditional commercial unixes which would have a separate filesystem for
everything: free space was never in the place where you actually needed it.
I'll grant that tmpfs is faster than other filesystems, but is it a win
on a real workload? I haven't seen anyone answer that.
It seems like this feature is trading a set of well-known problems for a
different set of problems without a killer reason.
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