Messages in this thread | | | From | "Stephen C. Tweedie" <> | Date | Tue, 20 Jul 1999 14:32:28 +0100 (BST) | Subject | Re: [RFC] - Some notions that I would like comments on |
| |
Hi,
On Mon, 19 Jul 1999 12:46:24 -0400 (EDT), Chuck Lever <cel@monkey.org> said:
> On Sun, 18 Jul 1999, Jamie Lokier wrote: >> The net result is once the readahead window opens up enough, >> filemap_nopage never waits on I/O, not even once per cluster. With the >> code in place it might even be worth using readahead that's smaller than >> the random access readaround cluster size. More I/Os, less memory used.
> more i/o's means less disk scalability, IMO.
Correct. 2.2 is substantially faster than 2.0 on low-memory machines, primarily because the benefit of doing fewer swap and paging IOs more than outweighs the extra memory used by the speculative IO.
--Stephen
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |