kernel cache and NFS

[liz <liz@unixgrrl.net>]

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Greetings,

I can't seem to find an answer to this issue anywhere.

A box running a 2.4.21 smp kernel is holding 2G of ram in the system
cache, despite being heavily into swap:

~        total:    used:    free:  shared: buffers:  cached:
Mem:  4224462848 4206002176 18460672        0 41304064 2938032128
Swap: 2146754560 1073373184 1073381376
MemTotal:      4125452 kB
MemFree:         18028 kB
MemShared:           0 kB
Buffers:         40336 kB
Cached:        2095616 kB                        <---- 2G disk cache
SwapCached:     773556 kB
Active:        3186300 kB
ActiveAnon:    1707252 kB
ActiveCache:   1479048 kB
Inact_dirty:    607944 kB
Inact_laundry:  117300 kB
Inact_clean:     65180 kB
Inact_target:   795344 kB
HighTotal:     3276224 kB
HighFree:         1200 kB
LowTotal:       849228 kB
LowFree:         16828 kB
SwapTotal:     2096440 kB                      <-- 1G swap usage
SwapFree:      1048224 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB

Why is this memoy being held in the disk cache? Is this perhaps an NFS
issue?

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