diff -up sos-2.2/sos/plugintools.py.orig sos-2.2/sos/plugintools.py
--- sos-2.2/sos/plugintools.py.orig	2011-08-15 01:33:35.900753944 +0100
+++ sos-2.2/sos/plugintools.py	2011-08-15 01:33:43.762754017 +0100
@@ -286,11 +286,19 @@ class PluginBase:
         files = glob.glob(fname)
         files.sort()
         cursize = 0
+        limit_reached = False
+        sizelimit *= 1024 * 1024 # in MB
         for flog in files:
             cursize += os.stat(flog)[ST_SIZE]
-            if sizelimit and (cursize / 1024 / 1024) > sizelimit:
-               break
-            self.addCopySpec(flog)
+            if sizelimit and cursize > sizelimit:
+                limit_reached = True
+            else:
+                self.addCopySpec(flog)
+            # Truncate the first file (others would likely be compressed),
+            # ensuring we get at least some logs
+            if flog == files[0] and limit_reached:
+                self.collectExtOutput("tail -c%d %s" % (sizelimit, flog),
+                    "tail_" + os.path.basename(flog))
 
     def addCopySpec(self, copyspec):
         """ Add a file specification (can be file, dir,or shell glob) to be