Messages in this thread | | | Date | Sun, 13 Jan 2002 19:55:14 -0500 (EST) | From | Bill Davidsen <> | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable |
| |
On Tue, 8 Jan 2002, Andrea Arcangeli wrote:
> Note that some of them are bugfixes, without them an luser can hang the > machine for several seconds on any box with some giga of ram by simple > reading and writing into a large enough buffer. I think we never had > time to care merging those bits into mainline yet and this is probably > the main reason they're not integrated but it's something that should be > in mainline IMHO.
Or just doing a large write while doing lots of reads... my personal nemesis is "mkisofs" for backups, which reads lots of small files and builds a CD image, which suddenly gets discovered by the kernel and written, seemingly in a monolythic chunk. I MAY be able to improve this with tuning the bdflush parameters, and I tried some tentative patches which didn't make a huge gain.
I don't know if the solution lies in forcing write to start when a certain size of buffers are queued regardless of percentages, or in better scheduling of reads ahead of writes, or whatever.
-- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979.
- 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/
| |