Re: lug-bg: Preemptive (was: Izleze linux-2.2.20 - 2.4 VM tests)

[g.vlaev@xxxxxxxxxx (Georgi Vlaev)]

On Monday 05 November 2001 11:40, you wrote:
> Imam nqkolko pitaniq mozhe i da sa lame :)
>
> On Monday 05 November 2001 10:01, you wrote:
> > Preemptive kernel e samo 1 ot uslowiqta za Real-Time.
>
> a koi sa drugite ?

na LinuxDevices ima 1000-di articles, news i t.n info za real-time, embedded 
i kakwoto se setish. Eto ti 1 gotin ot tqh :)

http://www.linuxdevices.com/articles/AT5709748392.html

Mojesh da procehtesh whitepaperite na powecheto real-time distribucii. 
Tam w osnowni linii pishe kak rabotqt.

>
> > oswen na http://kpreempt.sourceforge.net, peemptive patchove ima na
> >
> > http://www.tech9.net/rml/linux/
> >
> > - za 2.4.12 i 2.4.13 kakto i za ac kernelite. Moje da go slojite ako
> > polzwate Linux za desktop systema ili takawa koiato iska poweche
> > interactive response, no ne i za server. Efekta si zaslujava.
>
> vse oste ne mi e ostanalo vreme za tozi patch, no imam sledniq vypros:
> predpolagam preemtive feature  ste se izbira config time i posle compile
> ... Ako izbera da e preemptive kernela , posle dali ima vyzmozhnost
> run-time 4rez /proc  ili sysctl da switch-vam preemptive/non-preemptive  ?
> Ne e leka zada4a stoto si e direktna namesa v scheduling-a na kernela i
> predpolagam se ustanovqva tvurdo pri configuraciqta ?
>
> Na server mozhe bi ne e podhodqsto ponezhe mozhe po-visoko prioritetni
> procesi, no po-malovazhni da prekusvat vremenno drugi po-nisko prioritetni
> no po-vazhni...  primerno daemon procesite vurvqsti na background-a. No ako
> poslednite bydat renice-nati i im se set-ne po-visok prioritet , ne bi
> trqbvalo da ima problem spored men ... ?
>
> 10x

---------------------------------------------------------
Preemptible Kernel
CONFIG_PREEMPT
  This option reduces the latency of the kernel when reacting to
  real-time or interactive events by allowing a low priority process to
  be preempted even if it is in kernel mode executing a system call. 

>>>> "obiknoweniq" kernel moje da byde prekysnat samo on interrupt ili 
>>>> exception

  This allows applications to run more reliably even when the system is
  under load due to other, lower priority, processes.

  Say Y here if you are building a kernel for a desktop system, embedded
  system or real-time system.  Say N if you are building a kernel for a
  system where throughput is more important than interactive response,
  such as a server system.  Say N if you are unsure.
-----------------------------------------------------------

Compilirash i puskash. Ne moje da se promenq run-time.
Prez /proc moje da widish top 10 procesi s nai-golqmo latency, ako si 
istalirash drugia patch. 

bye
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