[squid-users] Vedr.: Re: [squid-users] Vedr.: Re: [squid-users] Big IO load.. with only few files.. how come?

Hi Adrian,

Here's a few lines of vmstat output..

Taken from when it were serving 900+ req/sec.

[root]# vmstat 1 100
   procs memory swap io system
cpu
 r b w swpd free buff cache si so bi bo in cs us sy
id
 1 0 1 4344 241360 73008 581044 0 0 0 0 18347 218 35
23 41
 1 0 1 4344 241368 73008 581036 0 0 0 0 18384 225 31
29 40
 1 0 1 4344 241340 73008 581052 0 0 0 812 18344 255 30
28 41
 1 0 1 4344 241256 73008 581052 0 0 0 0 18152 347 30
27 43
 0 0 1 4344 241180 73008 581084 0 0 16 0 18222 245 38
20 43
 1 0 0 4344 241044 73008 581084 0 0 0 0 18212 232 38
20 42
 1 0 1 4344 241040 73008 581088 0 0 0 0 18245 368 30
27 43
 1 0 1 4344 241040 73008 581088 0 0 0 588 18232 282 34
25 41
 1 0 0 4344 241028 73008 581088 0 0 0 0 18134 398 37
24 40
 1 0 1 4344 241020 73008 581096 0 0 0 0 18322 327 33
25 42
 1 0 1 4344 240972 73008 581108 0 0 0 0 18465 306 38
20 42
 2 0 1 4344 240972 73008 581108 0 0 0 0 18028 400 32
26 41
 1 0 1 4344 240972 73008 581108 0 0 0 780 18207 342 34
24 42
 2 0 1 4344 240968 73008 581112 0 0 0 0 18000 428 37
21 42
 1 0 1 4344 240960 73008 581120 0 0 0 0 18059 335 40

-------------| This mail has been sent to you by: |------------
Klavs Klavsen, IT-coordinator and Systems Administrator at
Metropol Online - http://www.metropol.dk
Tlf. 33752700, Fax 33752720, Email ktk@metropol.dk

Private- Email [email protected] - http://www.vsen.dk

--------------------[ I believe that... ]-----------------------
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people make them do, not what they themselves choose to do...
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seek their peopl's ideas, let them initiate new projects and
encourage more experiments. -- Rosabeth Moss Kanter

                                                                                                                       
                    Adrian Chadd
                    <adrian@squid- Til: Klavs Klavsen <ktk@metropol.dk>
                    cache.org> cc: squid-users@squid-cache.org
                                          Vedr.: Re: [squid-users] Vedr.: Re: [squid-users] Big IO load.. with only
                    13-11-2001 few files.. how come?
                    04:16
                                                                                                                       
                                                                                                                       

On Mon, Nov 12, 2001, Klavs Klavsen wrote:
>
> I read it wrong..
>
> it's not the IO that was heavily loaded.. (at approx 18.000 pr. sec) - it
> was interrupts..
>
> Do any of you know how many I can expect - before the machine stalls..
and
> what I can do to increase the ability to handle more interrupts?
>
> btw. it's a linux-2.4 kernel.
>
> I hope you have some tuning tips for me..
>
> and to Torsten.. thanks for all your help so far..
>

Uhm, if you're using iDE anywhere, make sure you've turned DMA on.
That's burnt me a few times when doing squid work under Linux.

A few lines of vmstat output when the cache is heavily loaded will
tell us where the bottleneck may be.

Adrian
Received on Tue Nov 13 2001 - 00:01:35 MST