RW wrote:
On Sun, 15 Jun 2008 01:19:46 +0200
Kris Kennaway <[EMAIL PROTECTED]> wrote:

RW wrote:
mdmfs(8) has an example of a malloc-backed md device mounted with
the async option. Is there any point in doing this with malloc and
vnode devices? In neither case does a write to the file-system
require a write to a physical disk.
Well, for vnode devices it does write to the disk,

I meant that a write to the filesystem doesn't require a corresponding
write to disk, and the change can stay in memory indefinitely.
Presumably, more or less, the same inactive pages get written-out to
swap, with or without async.

Well, it doesn't necessarily cause a write to disk for each filesystem write, but the synchronization mode of the filesystem to the backing store is precisely what the async/noasync/sync mount options control!

but that isn't the point; in both cases you are writing to the filesystem that is
mounted on top of the md, so that will be faster if it is mounted

In that case, why doesn't /etc/rc.d/tmp default to mounting its
swap-backed /tmp with async?

It should.


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