[LARTC] About HTB3

[LARTC] About HTB3

[yangrunhua]

Hi!
If I use HTB3 at 100M environment, does it give any improvement if I set
HZ\x1024?( I'm running an Intel PIII machine). Can you give me a short
answer? Thanks in advance. 
Regards, yangrunhua

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Re: [LARTC] About HTB3

[Alexey Talikov]

Don't set HZ to 1024 on intel - it a bad idea
it produce many problem for other parts of linux which use HZ\x100
HTB work fine on 100Mbit without any changes
If you use machine with low resources try RED or GRED but its classless


20.06.2002 9:53:50, "yangrunhua" <yangrunhua@njupt.edu.cn> wrote:

>Hi!
>If I use HTB3 at 100M environment, does it give any improvement if I set
>HZ\x1024?( I'm running an Intel PIII machine). Can you give me a short
>answer? Thanks in advance. 
>Regards, yangrunhua
>
>_______________________________________________
>LARTC mailing list / LARTC@mailman.ds9a.nl
>http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
>

-----------------------------------
mailto:alexey_talikov@texlab.com.uz
BR
Alexey Talikov
FORTEK
-----------------------------------


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Re: [LARTC] About HTB3

[bert hubert]

On Thu, Jun 20, 2002 at 10:45:11AM +0500, Alexey Talikov wrote:
> Don't set HZ to 1024 on intel - it a bad idea
> it produce many problem for other parts of linux which use HZ\x100

Can you elaborate? I know of only the 'top' problem but most other things
work well.

If you raise HZ you will get more precise shaping and less bursty traffic.

Regards,

bert

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Re: [LARTC] About HTB3

[Alexey Talikov]

I can't answer you completely ( this question for kernel maintainers ) :(
But as I know this value used for IRQ (see arch/i386/kernel/irq.c)
different kernel timers (arch/i386/kernel/time.c) for SMP (multiprocessor)
in APIC functions ASPI functions almost in all drivers even in PCI bus
and ATM subsystem and many many other

I have no idea about after-effects of change HZ !
I don't know about possibility to change this value only for traffic control functions !

I think change this value for Ix86 architecture not so simple !

If somebody have idea about this, share it with me !

23.06.2002 14:39:59, bert hubert <ahu@ds9a.nl> wrote:
>Can you elaborate? I know of only the 'top' problem but most other things
>work well.
>If you raise HZ you will get more precise shaping and less bursty traffic.
>Regards,
>bert
>http://www.PowerDNS.com          Versatile DNS Software & Services
>http://www.tk                              the dot in .tk
>http://lartc.org           Linux Advanced Routing & Traffic Control HOWTO
-----------------------------------
mailto:alexey_talikov@texlab.com.uz
BR
Alexey Talikov
FORTEK
-----------------------------------


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Re: [LARTC] About HTB3

[Martin Devera]

I change it regulary. I didn't experienced any problems - only
lockups on slow systems which can't handle it.
There should be no problem regarding the change.
devik

On Mon, 24 Jun 2002, Alexey Talikov wrote:

> I can't answer you completely ( this question for kernel maintainers ) :(
> But as I know this value used for IRQ (see arch/i386/kernel/irq.c)
> different kernel timers (arch/i386/kernel/time.c) for SMP (multiprocessor)
> in APIC functions ASPI functions almost in all drivers even in PCI bus
> and ATM subsystem and many many other
>
> I have no idea about after-effects of change HZ !
> I don't know about possibility to change this value only for traffic control functions !
>
> I think change this value for Ix86 architecture not so simple !
>
> If somebody have idea about this, share it with me !
>
> 23.06.2002 14:39:59, bert hubert <ahu@ds9a.nl> wrote:
> >Can you elaborate? I know of only the 'top' problem but most other things
> >work well.
> >If you raise HZ you will get more precise shaping and less bursty traffic.
> >Regards,
> >bert
> >http://www.PowerDNS.com          Versatile DNS Software & Services
> >http://www.tk                              the dot in .tk
> >http://lartc.org           Linux Advanced Routing & Traffic Control HOWTO
> -----------------------------------
> mailto:alexey_talikov@texlab.com.uz
> BR
> Alexey Talikov
> FORTEK
> -----------------------------------
>
>
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> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
>
>

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Re: [LARTC] About HTB3

[Amit Kucheria]

IMHO :)

HZ defines the heart beat of the Linux system in terms of 'jiffies'.  
Increasing HZ will increase the number of interrupts on the system (e.g.
timer interrupt) and hence might not be useful for typical desktops, since
handling these system interrupts will not leave much CPU time for
applications.

But for a server which usually does only one thing (e.g. enforcing QoS),
this increase in the interrupts should not be a problem.

I configure my servers with HZ\x1024 regularly in include/net/pkt_sched.h 
without any problems.

ciao,
Amit

On Mon, 24 Jun 2002, Martin Devera wrote:

> I change it regulary. I didn't experienced any problems - only
> lockups on slow systems which can't handle it.
> There should be no problem regarding the change.
> devik
> 
> On Mon, 24 Jun 2002, Alexey Talikov wrote:
> 
> > I can't answer you completely ( this question for kernel maintainers ) :(
> > But as I know this value used for IRQ (see arch/i386/kernel/irq.c)
> > different kernel timers (arch/i386/kernel/time.c) for SMP (multiprocessor)
> > in APIC functions ASPI functions almost in all drivers even in PCI bus
> > and ATM subsystem and many many other
> >
> > I have no idea about after-effects of change HZ !
> > I don't know about possibility to change this value only for traffic control functions !
> >
> > I think change this value for Ix86 architecture not so simple !
> >
> > If somebody have idea about this, share it with me !
> >

-- 
I'm an angel!!! Honest!
The horns are just there to hold the halo up straight.
^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^
                  Amit Kucheria
          EECS Grad. Research Assistant
         University of Kansas @ Lawrence
   (R): +1-785-830-8521 ||| (C): +1-785-760-2871
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Re: [LARTC] About HTB3

[Martin Devera]

Exactly :) Alphas used to set 1024 as default. It is because
Alpha was very low interrupt latency compared to x86.

On Mon, 24 Jun 2002, Amit Kucheria wrote:

> IMHO :)
>
> HZ defines the heart beat of the Linux system in terms of 'jiffies'.
> Increasing HZ will increase the number of interrupts on the system (e.g.
> timer interrupt) and hence might not be useful for typical desktops, since
> handling these system interrupts will not leave much CPU time for
> applications.
>
> But for a server which usually does only one thing (e.g. enforcing QoS),
> this increase in the interrupts should not be a problem.
>
> I configure my servers with HZ\x1024 regularly in include/net/pkt_sched.h
> without any problems.
>
> ciao,
> Amit
>
> On Mon, 24 Jun 2002, Martin Devera wrote:
>
> > I change it regulary. I didn't experienced any problems - only
> > lockups on slow systems which can't handle it.
> > There should be no problem regarding the change.
> > devik
> >
> > On Mon, 24 Jun 2002, Alexey Talikov wrote:
> >
> > > I can't answer you completely ( this question for kernel maintainers ) :(
> > > But as I know this value used for IRQ (see arch/i386/kernel/irq.c)
> > > different kernel timers (arch/i386/kernel/time.c) for SMP (multiprocessor)
> > > in APIC functions ASPI functions almost in all drivers even in PCI bus
> > > and ATM subsystem and many many other
> > >
> > > I have no idea about after-effects of change HZ !
> > > I don't know about possibility to change this value only for traffic control functions !
> > >
> > > I think change this value for Ix86 architecture not so simple !
> > >
> > > If somebody have idea about this, share it with me !
> > >
>
> --
> I'm an angel!!! Honest!
> The horns are just there to hold the halo up straight.
> ^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^
>                   Amit Kucheria
>           EECS Grad. Research Assistant
>          University of Kansas @ Lawrence
>    (R): +1-785-830-8521 ||| (C): +1-785-760-2871
> ____________________________________________________
>
>
>

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