r5639 - trunk/varnish-cache/doc/sphinx/tutorial

[perbu at varnish-cache.org]

Author: perbu
Date: 2010-11-30 17:00:19 +0100 (Tue, 30 Nov 2010)
New Revision: 5639

Modified:
   trunk/varnish-cache/doc/sphinx/tutorial/sizing_your_cache.rst
Log:
More on sizing

Modified: trunk/varnish-cache/doc/sphinx/tutorial/sizing_your_cache.rst
===================================================================
--- trunk/varnish-cache/doc/sphinx/tutorial/sizing_your_cache.rst	2010-11-30 10:28:15 UTC (rev 5638)
+++ trunk/varnish-cache/doc/sphinx/tutorial/sizing_your_cache.rst	2010-11-30 16:00:19 UTC (rev 5639)
@@ -16,3 +16,10 @@
    tool. If you have a lot of LRU activity then your cache is evicting
    objects due to space constraints and you should consider increasing
    the size of the cache.
+
+Be aware that every object that is stored also carries overhead that
+is kept outside the actually storage area. So, even if you specify -s
+malloc,16G varnish might actually use **double** that. Varnish has a
+overhead of about 1k per object. So, if you have lots of small objects
+in your cache the overhead might be significant.
+