* Re: [LARTC] About HTB3
2002-06-20 4:53 [LARTC] About HTB3 yangrunhua
@ 2002-06-20 5:45 ` Alexey Talikov
2002-06-23 9:39 ` bert hubert
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: Alexey Talikov @ 2002-06-20 5:45 UTC (permalink / raw)
To: lartc
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
>
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>LARTC mailing list / LARTC@mailman.ds9a.nl
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>
-----------------------------------
mailto:alexey_talikov@texlab.com.uz
BR
Alexey Talikov
FORTEK
-----------------------------------
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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [LARTC] About HTB3
2002-06-20 4:53 [LARTC] About HTB3 yangrunhua
2002-06-20 5:45 ` Alexey Talikov
@ 2002-06-23 9:39 ` bert hubert
2002-06-24 4:34 ` Alexey Talikov
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: bert hubert @ 2002-06-23 9:39 UTC (permalink / raw)
To: lartc
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
--
http://www.PowerDNS.com Versatile DNS Software & Services
http://www.tk the dot in .tk
http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [LARTC] About HTB3
2002-06-20 4:53 [LARTC] About HTB3 yangrunhua
2002-06-20 5:45 ` Alexey Talikov
2002-06-23 9:39 ` bert hubert
@ 2002-06-24 4:34 ` Alexey Talikov
2002-06-24 7:29 ` Martin Devera
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: Alexey Talikov @ 2002-06-24 4:34 UTC (permalink / raw)
To: lartc
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/
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [LARTC] About HTB3
2002-06-20 4:53 [LARTC] About HTB3 yangrunhua
` (2 preceding siblings ...)
2002-06-24 4:34 ` Alexey Talikov
@ 2002-06-24 7:29 ` Martin Devera
2002-06-24 7:40 ` Amit Kucheria
2002-06-24 7:52 ` Martin Devera
5 siblings, 0 replies; 7+ messages in thread
From: Martin Devera @ 2002-06-24 7:29 UTC (permalink / raw)
To: lartc
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
> -----------------------------------
>
>
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
>
>
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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [LARTC] About HTB3
2002-06-20 4:53 [LARTC] About HTB3 yangrunhua
` (3 preceding siblings ...)
2002-06-24 7:29 ` Martin Devera
@ 2002-06-24 7:40 ` Amit Kucheria
2002-06-24 7:52 ` Martin Devera
5 siblings, 0 replies; 7+ messages in thread
From: Amit Kucheria @ 2002-06-24 7:40 UTC (permalink / raw)
To: lartc
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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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [LARTC] About HTB3
2002-06-20 4:53 [LARTC] About HTB3 yangrunhua
` (4 preceding siblings ...)
2002-06-24 7:40 ` Amit Kucheria
@ 2002-06-24 7:52 ` Martin Devera
5 siblings, 0 replies; 7+ messages in thread
From: Martin Devera @ 2002-06-24 7:52 UTC (permalink / raw)
To: lartc
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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http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
^ permalink raw reply [flat|nested] 7+ messages in thread