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