Hi, we're seeing something odd on squid v2.6.18-1ubuntu3. I know this is an old version and not recommended but I just thought I'd point it out to make sure this has been fixed in a more recent version. After some time running, a couple of squid's pointers appear to be wrapping, like signed 32-bit integers. In particular: client_http.kbytes_out = -2112947050 We noticed this as we use munin, which queries the counters in this way and ignores negative values. The select_loops value is also negative. If this is fixed in v2.7 that's fair enough but I thought I'd mention it here in case it isn't. Gavin gavinmc@watcher:~$ nc localhost 8080 GET cache_object://localhost/counters HTTP/1.0 Accept: */* HTTP/1.0 200 OK Server: squid/2.6.STABLE18 Date: Mon, 05 Oct 2009 15:44:17 GMT Content-Type: text/plain Expires: Mon, 05 Oct 2009 15:44:17 GMT Last-Modified: Mon, 05 Oct 2009 15:44:17 GMT X-Cache: MISS from watcher.gcd.ie X-Cache-Lookup: MISS from watcher.gcd.ie:8080 Via: 1.0 watcher.gcd.ie:8080 (squid/2.6.STABLE18) Proxy-Connection: close sample_time = 1254757456.12734 (Mon, 05 Oct 2009 15:44:16 GMT) client_http.requests = 63518961 client_http.hits = 27155728 client_http.errors = 5191 client_http.kbytes_in = 77340031 client_http.kbytes_out = -2112947050 client_http.hit_kbytes_out = 261721929 server.all.requests = 36663719 server.all.errors = 0 server.all.kbytes_in = 1908075341 server.all.kbytes_out = 61829714 server.http.requests = 36233326 server.http.errors = 0 server.http.kbytes_in = 1901156005 server.http.kbytes_out = 59068791 server.ftp.requests = 28 server.ftp.errors = 0 server.ftp.kbytes_in = 941732 server.ftp.kbytes_out = 4 server.other.requests = 430365 server.other.errors = 0 server.other.kbytes_in = 5977603 server.other.kbytes_out = 2760918 icp.pkts_sent = 0 icp.pkts_recv = 0 icp.queries_sent = 0 icp.replies_sent = 0 icp.queries_recv = 0 icp.replies_recv = 0 icp.query_timeouts = 0 icp.replies_queued = 0 icp.kbytes_sent = 0 icp.kbytes_recv = 0 icp.q_kbytes_sent = 0 icp.r_kbytes_sent = 0 icp.q_kbytes_recv = 0 icp.r_kbytes_recv = 0 icp.times_used = 0 cd.times_used = 0 cd.msgs_sent = 36 cd.msgs_recv = 36 cd.memory = 0 cd.local_memory = 6481 cd.kbytes_sent = 3 cd.kbytes_recv = 48 unlink.requests = 0 page_faults = 6 select_loops = -1656175576 cpu_time = 78423.850000 wall_time = 1.478176 swap.outs = 12350417 swap.ins = 39255680 swap.files_cleaned = 1158 aborted_requests = 1300408