[OpenAFS-devel] good and bad performance of memory cache

[chas williams]

the default chunksize for memcache is too small.  some results i posted
earlier about tuning memcache:


Version 1.02c       ------Sequential Output------ --Sequential Input- --Random-
		    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP

linux/memcache=18m
	       256M  3669  68  7695  33  1413   7  1566  24  1739   2 218.5   2
linux/memcache=18m,chunksize=15
	       256M  3968  70  8966  32  2935  12  3381  50  4310   5  96.7   1

solaris8/memcache=146m
	       256M  2415  41  3054  34  1546  13  1966  17  1895   8 155.0   6
solaris8/memcache=146m,chunksize=15
	       256M  4666  56  6339  41  3457  20  4465  39  5447  15  87.3   5