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RE: Directors - how fast??

To: <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: RE: Directors - how fast??
From: Radu-Adrian Feurdean <raf@xxxxxxxx>
Date: Wed, 26 Sep 2001 11:35:53 +0200 (CEST)
On Wed, 26 Sep 2001, Julian Anastasov wrote:

>
>       Hello,
>
> On Tue, 25 Sep 2001, Zachariah Mully wrote:
>
> >     What then would be a good tool to use to check on performance? vmstat?
> > What would one be looking for? Is there a better tool?
> >     My measly Celery 400 w/256 meg RAM (directs 2.2gig of traffic/1.2
> > million file downloads between 8am and 7pm daily) has the following
> > vmstat output:
> >
> >    procs                      memory    swap          io     system
> > cpu
> >  r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us
> > sy  id
> >  0  0  0      0 152652  19596  35160   0   0     0     0    4     4   0
> > 0   9
>
>       vmstat is good but your output is absolutely incorrect. I don't
> see "in" >= 100 (HZ). OTOH, us+sy+id should be ~100%. I saw some old
> vmstat versions to wrap the interrupt number when reading /proc/stat,
> IIRC. What reports ps -V or ps --version ?

The first line ov vmstat always gives incorrect values for me:

# vmstat 1
   procs                      memory    swap          io     system
cpu
 r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
 2  0  0      0  68420 214136 426712   0   0     0     2    3     3   3   3  0
 0  0  0      0  68416 214136 426712   0   0     0     0 16722    10   0  37 63
 0  0  0      0  68416 214136 426712   0   0     0     0 16462     7   0  36 64
 0  0  0      0  68416 214136 426712   0   0     0     0 16335     7   0  39 61
 0  0  0      0  68416 214136 426712   0   0     0     0 17193     6   0  39 61
 0  0  0      0  68416 214136 426712   0   0     0     0 16708     6   0  41 59
 0  0  0      0  68416 214136 426712   0   0     0    46 16073    10   0  43 57
 0  0  0      0  68416 214136 426712   0   0     0     0 16104     8   0  32 68
 0  0  0      0  68416 214136 426712   0   0     0     0 16126    10   0  36 64
 0  0  0      0  68416 214136 426712   0   0     0     0 16391     6   0  33 67

... returning at performace chapter, that was sampled while forwarding 40Mbps
of LVS/NAT traffic on a single 866 Mhz PIII.

For those concerned by ofther things than CPU power and RAM, pay attention to
si/so and bi/bo fields. They are almost constantly 0. So don't waste your
money to buy 40Gb SCSI HDDs like some people have the tendence to do for any
production machine.


 Radu-Adrian Feurdean
mailto: raf @ chez.com
---------------------------------------------------------------
Chemicals: Noxious substances from which modern foods are made.



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