Re: swapping and the value of /proc/sys/vm/swappiness

[Ray Bryant]

Nick Piggin wrote:
> Nick Piggin wrote:
>
> > Thanks Ray. From looking over your old results, it appears that 
> > -kswapdfix
> > probably has the nicest swappiness ramp, which is probably to be 
> > expected,
> > as the problem that is being fixed did exist in all other kernels you 
> > tested,
> > but the later ones just had other aggrivating changes.
> >
> > The swappiness=60 weirdness might just be some obscure interaction 
> > with the
> > workload. If that is the case, it is probably not too important, 
> > however it
> > could be due to a possible oversight in my patch....
>
> Here is a patch on top of the last one - if you can give it a test
> some time, that would be great.
>
> Thanks
> Nick

Hi Nick,

Here are the results for the kswapd2 patch, along with the previous version 
and the original 2.6.9-rc1-mm3 test.  It pretty much looks like a wash between
the kswapd and kswapd2 patches.

Kernel Version 2.6.9-rc1-mm3:
        Total I/O   Avg Swap   min    max     pg cache    min    max
       ----------- --------- ------- ------  --------- ------- -------
   0   274.80 MB/s  10511 MB (  5644, 14492)  13293 MB (  8596, 17156)
  20   267.02 MB/s  12624 MB (  5578, 16287)  15298 MB (  8468, 18889)
  40   267.66 MB/s  13541 MB (  6619, 17461)  16199 MB (  9393, 20044)
  60   233.73 MB/s  18094 MB ( 16550, 19676)  20629 MB ( 19103, 22192)
  80   213.64 MB/s  20950 MB ( 15844, 22977)  23450 MB ( 18496, 25440)
 100   164.58 MB/s  26004 MB ( 26004, 26004)  28410 MB ( 28327, 28455)


Kernel Version 2.6.9-rc1-mm3-kdb-kswapdfix:
        Total I/O   Avg Swap   min    max     pg cache    min    max
       ----------- --------- ------- ------  --------- ------- -------
   0   279.97 MB/s     89 MB (    12,   265)   3062 MB (  2947,  3267)
  20   283.55 MB/s    161 MB (    15,   372)   3190 MB (  3011,  3427)
  40   282.32 MB/s    204 MB (     6,   407)   3187 MB (  2995,  3331)
  60   279.42 MB/s     72 MB (    15,   171)   3091 MB (  3027,  3155)
  80   283.34 MB/s    920 MB (   144,  3028)   3904 MB (  3106,  5957)
 100   160.55 MB/s  26008 MB ( 26007, 26008)  28473 MB ( 28455, 28487)

Kernel Version 2.6.9-rc1-mm3-kdb-kswapdfix2:
        Total I/O   Avg Swap   min    max     pg cache    min    max
       ----------- --------- ------- ------  --------- ------- -------
   0   282.71 MB/s    247 MB (     8,   691)   3248 MB (  2995,  3636)
  20   281.96 MB/s    127 MB (     3,   300)   3097 MB (  2931,  3283)
  40   282.24 MB/s    252 MB (    16,   417)   3270 MB (  3059,  3475)
  60   281.27 MB/s    404 MB (   106,  1070)   3414 MB (  3139,  4068)
  80   281.30 MB/s    494 MB (   204,   662)   3485 MB (  3187,  3635)
 100   160.35 MB/s  26003 MB ( 26003, 26003)  28477 MB ( 28407, 28519)

--
Best Regards,
Ray
-----------------------------------------------
                  Ray Bryant
512-453-9679 (work)         512-507-7807 (cell)
raybry@xxxxxxx             raybry@xxxxxxxxxxxxx
The box said: "Requires Windows 98 or better",
           so I installed Linux.
-----------------------------------------------

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