From my opinf of view, try to use DirectIO

Andrew Edunov wrote:
> Hi again!
>
> Some news:
>
> sunset:~ # cat /proc/meminfo
> MemTotal:   33277372 kB
> MemFree:     571576 kB
> Buffers:      50596 kB
> Cached:     29135348 kB
> SwapCached:       4 kB
> Active:     9099044 kB
> Inactive:   21225556 kB
> HighTotal:   32636632 kB
> HighFree:     200196 kB
> LowTotal:     640740 kB
> LowFree:     371380 kB
> SwapTotal:   33559776 kB
> SwapFree:   33559772 kB
> Dirty:         212 kB
> Writeback:       0 kB
> Mapped:     1177320 kB
> Slab:       202236 kB
> Committed_AS: 1656032 kB
> PageTables:    43936 kB
> VmallocTotal:  112632 kB
> VmallocUsed:   19836 kB
> VmallocChunk:   92668 kB
> HugePages_Total: 1024
> HugePages_Free:   150
> Hugepagesize:   2048 kB
>
>
> sunset:~ # sar
> Linux 2.6.5-7.282-bigsmp (sunset)     11/16/06
> 10:30:01       all   45.62    0.00   24.20    6.13   24.06
> 10:40:01       all   61.94    0.00   34.22    0.48    3.35
> 10:50:01       all   65.69    0.00   34.18    0.06    0.07
> 11:00:04       all   55.89    0.00   32.69    0.63   10.79
> 11:10:01       all   59.31    0.00   31.46    0.72    8.51
> 11:20:01       all   62.78    0.00   33.33    1.73    2.16
> 11:30:01       all   55.71    0.00   28.24    0.47   15.58
> 11:40:01       all   47.62    0.00   26.79    0.85   24.74
> 11:50:01       all   36.36    0.00   20.58    3.65   39.41
>
> 11:50:01       CPU   %user   %nice  %system  %iowait   %idle
> 12:00:01       all   40.71    0.00   22.98    2.24   34.07
> 12:10:01       all   48.73    0.00   28.34    3.66   19.26
> 12:20:01       all   55.78    0.00   29.35    2.37   12.50
> 12:30:03       all   64.31    0.00   31.16    0.20    4.33
> 12:40:01       all   60.99    0.00   30.78    0.71    7.52
> Average:       all   39.68    0.00   24.09    3.64   32.59
>
> sunset:~ # vmstat 5
> procs -----------memory---------- ---swap-- -----io---- --system--
> ----cpu----
> r b  swpd  free  buff cache  si  so   bi   bo  in   cs us sy id
> wa
> 1 1    4 466144 51712 29146568   0   0  188  116 316   84 39 24
> 34 4
> 3 0    4 470476 51796 29146484   0   0   2 7247 2667 1965 36 22
> 32 9
> 1 0    4 557028 51876 29146404   0   0   8 3554 3045 2565 28 17
> 50 5
> 2 0    4 548612 52020 29146260   0   0  152  178 3597 2944 20 11
> 67 2
> 2 0    4 544504 52100 29147208   0   0   91  448 3517 2905 37 17
> 45 1
> 1 0    4 541272 52148 29147160   0   0   0  604 3624 2962 28 13
> 59 0
> 1 0    4 540420 52276 29147032   0   0   54  270 2731 2013 20 11
> 66 3
> 3 0    4 540908 52368 29146940   0   0   2  186 1123  173 27 15
> 57 0
> 6 1    4 519348 52496 29147840   0   0  312  231 1245  315 50 28
> 18 3
> 3 0    4 524788 52600 29147736   0   0   34  185 1087  135 49 25
> 26 0
> 3 0    4 529244 52680 29148684   0   0   5  452 1160  181 41 27
> 32 0
> 2 0    4 528284 52760 29149632   0   0   0  482 1141  139 51 29
> 20 0
> 2 0    4 508692 52864 29149528   0   0   2  373 1175  122 44 27
> 28 1
> 3 0    4 503592 52952 29149440   0   0   56  136 1081  117 36 24
> 39 2
> 2 0    4 524292 53040 29150380   0   0   37  244 1090  123 34 20
> 45 1
> 3 0    4 510652 53124 29151324   0   0  154  228 1257  272 34 20
> 46 1
>
> Still 20-30% takes kernel. Any ideas?
>
> Best regards,
>   Andrew Edunov.
>
>
>  

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