Messages in this thread | | | Date | Mon, 8 Jan 2007 09:17:55 -0500 | From | Theodore Tso <> | Subject | Re: How git affects kernel.org performance |
| |
On Mon, Jan 08, 2007 at 02:59:52PM +0100, Pavel Machek wrote: > Hi! > > > > Would e2fsck -D help? What kind of optimization > > > does it perform? > > > > It will help a little; e2fsck -D compresses the logical view of the > > directory, but it doesn't optimize the physical layout on disk at all, > > and of course, it won't help with the lack of readahead logic. It's > > possible to improve how e2fsck -D works, at the moment, it's not > > trying to make the directory be contiguous on disk. What it should > > probably do is to pull a list of all of the blocks used by the > > directory, sort them, and then try to see if it can improve on the > > list by allocating some new blocks that would make the directory more > > contiguous on disk. I suspect any improvements that would be seen by > > doing this would be second order effects at most, though. > > ...sounds like a job for e2defrag, not e2fsck...
I wasn't proposing to move other data blocks around in order make the directory be contiguous, but just a "quick and dirty" try to make things better. But yes, in order to really fix layout issues you would have to do a full defrag, and it's probably more important that we try to fix things so that defragmentation runs aren't necessary in the first place....
- Ted
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |