High value of shm_flushes in Varnish 3.0.5 -

we've hight value of shm_flushes in varnishstat:

hitrate ratio:        0        0        0 hitrate avg:     0.0000   0.0000   0.0000       3900996        90.85          inf backend_busy - backend conn. many     12498808       228.62          inf backend_reuse - backend conn. reuses      9950893       186.69          inf backend_toolate - backend conn. closed        35649         0.00          inf backend_recycle - backend conn. recycles       733236        10.98          inf backend_retry - backend conn. retry        94911         0.00          inf fetch_head - fetch head          468         0.00          inf fetch_eof - fetch eof      1962214        25.96          inf fetch_bad - fetch had bad headers        16922         0.00          inf fetch_close - fetch wanted close      1979182        34.94          inf fetch_oldhttp - fetch pre http/1.1 closed           26         0.00          inf fetch_zero - fetch 0 len          927         0.00          inf fetch_failed - fetch failed      1260014        29.95          inf fetch_1xx - fetch no body (1xx)       332729         5.99          inf fetch_204 - fetch no body (204)         7341          .            .   n_sess - n struct sess          112          .            .   n_objectcore - n struct objectcore       456054          .            .   n_vbc - n struct vbc          762          .            .   n_wrk - n worker threads          427       -40.93          inf n_wrk_create - n worker threads created       368860        -2.00          inf n_wrk_failed - n worker threads not created       368974         2.00          inf n_wrk_lqueue - work request queue length       361762        11.98          inf n_wrk_queued - n queued work requests          115         0.00          inf n_wrk_drop - n dropped work requests           42          .            .   n_backend - n backends          115          .            .   n_expired - n expired objects         2747          .            .   n_lru_nuked - n lru nuked objects        18073         0.00          inf n_objwrite - objects sent write           14         0.00          inf s_sess - total sessions       364370        12.98          inf s_req - total requests      7843107       119.80          inf s_pass - total pass      9802175       187.68          inf s_bodybytes - total body bytes      3900985       108.82          inf sess_pipeline - session pipeline     12498808       228.62          inf sess_readahead - session read ahead            6         0.00          inf sess_linger - session linger      1323887        26.95          inf sess_herd - session herd      2056953        37.94          inf shm_records - shm records   4873964594     91989.09          inf shm_writes - shm writes 304821503001   6421550.43          inf shm_flushes - shm flushes due overflow      1057284        31.95          inf shm_cont - shm mtx contention          102         0.00          inf shm_cycles - shm cycles through buffer           94         0.00          inf sms_nreq - sms allocator requests     11853499          .            .   sms_nobj - sms outstanding allocations     10496270          .            .   sms_nbytes - sms outstanding bytes    655590062          .            .   sms_balloc - sms bytes allocated     38937693          .            .   sms_bfree - sms bytes freed       211416         2.00          inf n_vcl - n vcl total          302         0.00          inf n_vcl_avail - n vcl available        24886         0.00          inf n_vcl_discard - n vcl discarded     10704338         0.00          inf n_ban_add - n new bans added     10704338         0.00          inf n_ban_retire - n old bans deleted      2057082        25.96          inf n_ban_obj_test - n objects tested            3         0.00          inf n_ban_re_test - n regexps tested against            3         0.00          inf n_ban_dups - n duplicate bans removed            2         0.00          inf hcb_lock - hcb lookups lock            1         0.00          inf hcb_insert - hcb inserts            2         0.00          inf esi_errors - esi parse errors (unlock)          535         0.00          inf accept_fail - accept failures          535         0.00          inf client_drop_late - connection dropped late     10718794       175.70          inf dir_dns_lookups - dns director lookups       610318         4.99          inf dir_dns_failed - dns director failed lookups       610316         4.99          inf dir_dns_hit - dns director cached lookups hit 

also hitrate shown 0, have cache hits in varnish can see in responses , varnishlog

we tried -p shm_workspace=16384 in daemon_opts shm_flushes still increasing.

shouldn't value of shm_flushes 0?

this listing/output doesn't make sense.

shm_flushes should in same order shm_records. 6.4 million per second isn't.

i suspect you're using wrong version of libvarnishapi.