Messages in this thread | | | From | "Khimenko Victor" <> | Date | Thu, 9 Mar 2000 04:08:23 +0300 (MSK) | Subject | Re: Linux responsiveness under heavy load |
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In <38C6E35C.3A2FE466@timpanogas.com> Jeff V. Merkey (jmerkey@timpanogas.com) wrote:
> All,
> FYI. Earlier versions of Windows NT had this same problem (and it still > does). The way they got around it was to "cheat" by cranking up the > priority of the console an Windows GUI subsystem anytime someone hit a > key or moved the mouse. In fact, an NT server is still heavily loaded, > but by making the display look and feel "snappy", it presents the > illusion that the server has great responsiveness under heavy load. > This stuff in NT is all hard coded (Since their GUI is tightly > integrated with the OS), and if Linux wanted to do the same, the X > Server and bash would probably be the places to do this .....
Oh, do not talk about NT here. When I start dMail in NT (see headers of my mail :-) then suddenly I feel that I just switched from PentiumII-350 to 486DX66 (if not 386DX33 :-). dMail is simple DOS program and it does not do anything criminal (for DOS program that is): it just sits in tight loop to show current time in statu bar. At lest in Linux I do not feel background dMail even if I see dosemu eating almost 100% of cpu ...
P.S. I'm NOT talking about dMail itself -- it works great. Just MS Office need few seconds to open up menu when there are idle dMail in the background. And when I press letter I see it inserted in typed text after visible delay...
> Andrea Arcangeli wrote: >> >> On Wed, 8 Mar 2000, Nicolas MONNET wrote: >> >> >I've noticed that under heavy loads, and actually, not so heavy loads, >> >Linux's responsiveness is effectively very poor. >> >> Which kernel version are you using? >> >> >[..] The >> >system isn't even swapping, [..] >> >> Supposing you are using 2.2.x if it wasn't VM related it's probably the >> elevator starvation thing. Could you try again with 2.2.14aa10 (it >> includes elevator-starvation-6.gz): >> >> ftp://ftp.*.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.2/2.2.14aa10.gz >> >> For reference the elevator-starvation-6.gz patch alone is here: >> >> ftp://ftp.*.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.2/2.2.14aa10/elevator-starvation-6.gz >> >> >It's not like there's a bunch of runaway processe: at most, 5 processes >> >are running. >> >> To be sure about what's going on could you provide me a `vmstat 1` log >> of before/during/after the performance drop? >> >> Andrea >>
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