Messages in this thread | | | Date | Thu, 17 Jan 2002 14:08:41 -0500 | Subject | Re: Rik spreading bullshit about VM | From | (bill davidsen) |
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In article <20020116202640.A485@earthlink.net> you write: | About running the Andrea VM in 4M: | I booted in single user mode. | | bash-2.05a# uname -a | Linux mountain 2.4.18pre2aa2 #1 Wed Jan 9 21:44:03 EST 2002 i586 unknown | | bash-2.05a# dmesg| grep mem | Kernel command line: BOOT_IMAGE=2418p2aa2 ro root=1602 console=ttyS1,38400n8 single mem=4m | Memory: 2100k/4096k available (891k kernel code, 1608k reserved, 215k data, 196k init, 0k highmem) | Freeing unused kernel memory: 196k freed
[...snip...]
| I've tested a bunch of kernels lately. This is only what's sitting in /boot | since I last cleaned it out: | | mountain:/boot$ ls vml* | vmlinuz vmlinuz-2.4.17rc2aa2-old vmlinuz-2.4.18-pre3 | vmlinuz-2.4.18pre2 vmlinuz-2.4.18pre3ll vmlinuz-2.5.1-dj11 | vmlinuz-2.5.2-pre10 vmlinuz-2.5.2-pre9 vmlinuz-2.4.17 | vmlinuz-2.4.17rc2aa2-wli vmlinuz-2.4.18-pre4 vmlinuz-2.4.18pre2aa1 | vmlinuz-2.4.18pre3pe vmlinuz-2.5.1-dj13 vmlinuz-2.5.2-pre11 | vmlinuz-2.5.2-pre9mingo vmlinuz-2.4.17-rmap11a vmlinuz-2.4.17rmap11b | vmlinuz-2.4.18pre1-mjc2nio vmlinuz-2.4.18pre2aa2 vmlinuz-2.4.18pre3pelb | vmlinuz-2.5.1-dj14 vmlinuz-2.5.2-pre5 vmlinuz.old | vmlinuz-2.4.17rc2aa2 vmlinuz-2.4.18-pre1 vmlinuz-2.4.18pre1mjc2 | vmlinuz-2.4.18pre3-ac2 vmlinuz-2.5.1 vmlinuz-2.5.2 | vmlinuz-2.5.2-pre6-mingo | | IMHO, 2.4.18pre2aa2 is the best!
Of the current kernels it may well be, I have tried it on two largish machines and it worked "right," I'm building it on a small and slow machine to try that. However, I was not happy with the default bdflush settings, and people who don't see what they want should use the expanded capabilities of -aa before complaining. Also, the performance I've seen so far, and I have NOT run a full set of tests, would indicate that it is slightly better than 2.4.13-acN (N is 5, 7 or 8, don't have it on this machine).
I am looking forward to testing on many configs, and just for the extra tuning tools in bdflush I think it will be good on all of them. As I posted before, I think the best scheduler is the one which doesn't have "jackpot cases" which produce really bad performance. With a little tuning I believe -aa is there.
Finally, that said I'm trying a patch of my own to -aa, which is why I haven't run the full set of tests, there are two things I think will make it even better, and I am finally getting to understand the code, little as I wanted to.
I can't disagree with Rik on the VM in the unpatched kernel for several months. It really was not good, and both the -ac and -aa kernels were taking aim at that problem. IMHO the changes went in before the bugs went out. Needless to say Rik should not apply for a job as a diplomat, but I can't disagree with the existance of a problem. If RH uses a custom VM he was factual about that, although there may be several reasons for the choice.
Maybe we could deflect the pissing contest back to technical discussion now? -- 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/
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