James Bottomley wrote:
On Tue, 2005-08-30 at 10:56 +1000, Nick Piggin wrote:
Gang lookup is mainly used on IO paths but also on truncate,
which is a reasonably fast path on some workloads (James,
this is my suggestion for what you should test - truncate).
Actually, I don't think I can test this. In order to show a difference
between index 5 and index 6 on 32 bit, I'd have to deal with files > 4GB
in size. My 32 bit machines are the voyagers and only have 4GB discs.
The machine with all the huge discs, is, naturally, ia64.
Sorry, I meant for testing your gang lookup speedups.
For testing regular lookups, yeah that's more difficult. For a
microbenchmark you can use sparse files, which can be a good
trick for testing pagecache performance without the IO.
Nick
Send instant messages to your online friends http://au.messenger.yahoo.com
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
