当运行Varnish 4.0.3并查看varnishstat时，它报告的缓存命中率约为0.9-0.95，我将其解释为90-95％缓存命中率（不正确？）。我有一个非常低的命中次数，所以我看不到有很多流量不可缓存。困扰我的部分是尽管如此，后端服务器仍在运行。当我看到iftop时，我发现服务器（没有运行任何其他应用程序）正在以大约19Mbit的速度进行传输（包括客户端的答案和向后端服务器请求标头）并从后端服务器接收大约14Mbit。
我可以补充一点，我的缓存中也有一个小的宽限期，我看到每秒大约有1-2个请求被计为点击但仍然向后端发出请求，但这是一个无关紧要的请求数。
我必须遗漏一些显而易见的事情。但是什么？
编辑：
MAIN.uptime 70613 1.00 Child process uptime
MAIN.sess_conn 43313 0.61 Sessions accepted
MAIN.sess_drop 0 0.00 Sessions dropped
MAIN.sess_fail 0 0.00 Session accept failures
MAIN.sess_pipe_overflow 0 0.00 Session pipe overflow
MAIN.client_req_400 0 0.00 Client requests received, subject to 400 errors
MAIN.client_req_411 0 0.00 Client requests received, subject to 411 errors
MAIN.client_req_413 0 0.00 Client requests received, subject to 413 errors
MAIN.client_req_417 0 0.00 Client requests received, subject to 417 errors
MAIN.client_req 6438096 91.17 Good client requests received
MAIN.cache_hit 5231719 74.09 Cache hits
MAIN.cache_hitpass 149819 2.12 Cache hits for pass
MAIN.cache_miss 619678 8.78 Cache misses
MAIN.backend_conn 19491 0.28 Backend conn. success
MAIN.backend_unhealthy 0 0.00 Backend conn. not attempted
MAIN.backend_busy 0 0.00 Backend conn. too many
MAIN.backend_fail 0 0.00 Backend conn. failures
MAIN.backend_reuse 1279156 18.12 Backend conn. reuses
MAIN.backend_toolate 5046 0.07 Backend conn. was closed
MAIN.backend_recycle 1284221 18.19 Backend conn. recycles
MAIN.backend_retry 5 0.00 Backend conn. retry
MAIN.fetch_head 7 0.00 Fetch no body (HEAD)
MAIN.fetch_length 166348 2.36 Fetch with Length
MAIN.fetch_chunked 861097 12.19 Fetch chunked
MAIN.fetch_eof 0 0.00 Fetch EOF
MAIN.fetch_bad 0 0.00 Fetch bad T-E
MAIN.fetch_close 862 0.01 Fetch wanted close
MAIN.fetch_oldhttp 0 0.00 Fetch pre HTTP/1.1 closed
MAIN.fetch_zero 192834 2.73 Fetch zero len body
MAIN.fetch_1xx 0 0.00 Fetch no body (1xx)
MAIN.fetch_204 0 0.00 Fetch no body (204)
MAIN.fetch_304 77295 1.09 Fetch no body (304)
MAIN.fetch_failed 0 0.00 Fetch failed (all causes)
MAIN.fetch_no_thread 0 0.00 Fetch failed (no thread)
MAIN.pools 2 . Number of thread pools
MAIN.threads 400 . Total number of threads
MAIN.threads_limited 0 0.00 Threads hit max
MAIN.threads_created 400 0.01 Threads created
MAIN.threads_destroyed 0 0.00 Threads destroyed
MAIN.threads_failed 0 0.00 Thread creation failed
MAIN.thread_queue_len 0 . Length of session queue
MAIN.busy_sleep 22 0.00 Number of requests sent to sleep on busy objhdr
MAIN.busy_wakeup 22 0.00 Number of requests woken after sleep on busy objhdr
MAIN.sess_queued 0 0.00 Sessions queued for thread
MAIN.sess_dropped 0 0.00 Sessions dropped for thread
MAIN.n_object 61732 . object structs made
MAIN.n_vampireobject 0 . unresurrected objects
MAIN.n_objectcore 61791 . objectcore structs made
MAIN.n_objecthead 59996 . objecthead structs made
MAIN.n_waitinglist 100 . waitinglist structs made
MAIN.n_backend 8 . Number of backends
MAIN.n_expired 412530 . Number of expired objects
MAIN.n_lru_nuked 0 . Number of LRU nuked objects
MAIN.n_lru_moved 1938371 . Number of LRU moved objects
MAIN.losthdr 0 0.00 HTTP header overflows
MAIN.s_sess 43313 0.61 Total sessions seen
MAIN.s_req 6438096 91.17 Total requests seen
MAIN.s_pipe 192 0.00 Total pipe sessions seen
MAIN.s_pass 586507 8.31 Total pass-ed requests seen
MAIN.s_fetch 1206185 17.08 Total backend fetches initiated
MAIN.s_synth 0 0.00 Total synthethic responses made
MAIN.s_req_hdrbytes 4609529442 65278.77 Request header bytes
MAIN.s_req_bodybytes 615275 8.71 Request body bytes
MAIN.s_resp_hdrbytes 2888897421 40911.69 Response header bytes
MAIN.s_resp_bodybytes 95537815896 1352977.72 Response body bytes
MAIN.s_pipe_hdrbytes 57835 0.82 Pipe request header bytes
MAIN.s_pipe_in 45698 0.65 Piped bytes from client
MAIN.s_pipe_out 1305816 18.49 Piped bytes to client
MAIN.sess_closed 24747 0.35 Session Closed
MAIN.sess_pipeline 0 0.00 Session Pipeline
MAIN.sess_readahead 0 0.00 Session Read Ahead
MAIN.sess_herd 813362 11.52 Session herd
MAIN.shm_records 512140676 7252.78 SHM records
MAIN.shm_writes 18119050 256.60 SHM writes
MAIN.shm_flushes 788498 11.17 SHM flushes due to overflow
MAIN.shm_cont 89983 1.27 SHM MTX contention
MAIN.shm_cycles 277 0.00 SHM cycles through buffer
MAIN.sms_nreq 0 0.00 SMS allocator requests
MAIN.sms_nobj 0 . SMS outstanding allocations
MAIN.sms_nbytes 0 . SMS outstanding bytes
MAIN.sms_balloc 0 . SMS bytes allocated
MAIN.sms_bfree 0 . SMS bytes freed
MAIN.backend_req 1298448 18.39 Backend requests made
MAIN.n_vcl 1 0.00 Number of loaded VCLs in total
MAIN.n_vcl_avail 1 0.00 Number of VCLs available
MAIN.n_vcl_discard 0 0.00 Number of discarded VCLs
MAIN.bans 1 . Count of bans
MAIN.bans_completed 1 . Number of bans marked 'completed'
MAIN.bans_obj 0 . Number of bans using obj.*
MAIN.bans_req 0 . Number of bans using req.*
MAIN.bans_added 1 0.00 Bans added
MAIN.bans_deleted 0 0.00 Bans deleted
MAIN.bans_tested 0 0.00 Bans tested against objects (lookup)
MAIN.bans_obj_killed 0 0.00 Objects killed by bans (lookup)
MAIN.bans_lurker_tested 0 0.00 Bans tested against objects (lurker)
MAIN.bans_tests_tested 0 0.00 Ban tests tested against objects (lookup)
MAIN.bans_lurker_tests_tested 0 0.00 Ban tests tested against objects (lurker)
MAIN.bans_lurker_obj_killed 0 0.00 Objects killed by bans (lurker)
MAIN.bans_dups 0 0.00 Bans superseded by other bans
MAIN.bans_lurker_contention 0 0.00 Lurker gave way for lookup
MAIN.bans_persisted_bytes 13 . Bytes used by the persisted ban lists
MAIN.bans_persisted_fragmentation 0 . Extra bytes in persisted ban lists due to fragmentation
MAIN.n_purges 0 . Number of purge operations executed
MAIN.n_obj_purged 0 . Number of purged objects
MAIN.exp_mailed 949607 13.45 Number of objects mailed to expiry thread
MAIN.exp_received 949607 13.45 Number of objects received by expiry thread
MAIN.hcb_nolock 6001341 84.99 HCB Lookups without lock
MAIN.hcb_lock 447556 6.34 HCB Lookups with lock
MAIN.hcb_insert 447556 6.34 HCB Inserts
MAIN.esi_errors 0 0.00 ESI parse errors (unlock)
MAIN.esi_warnings 0 0.00 ESI parse warnings (unlock)
MAIN.vmods 2 . Loaded VMODs
MAIN.n_gzip 558747 7.91 Gzip operations
MAIN.n_gunzip 22866 0.32 Gunzip operations
MAIN.vsm_free 970832 . Free VSM space
MAIN.vsm_used 83963776 . Used VSM space
MAIN.vsm_cooling 0 . Cooling VSM space
MAIN.vsm_overflow 0 . Overflow VSM space
MAIN.vsm_overflowed 0 0.00 Overflowed VSM space
MGT.uptime 70613 1.00 Management process uptime
MGT.child_start 1 0.00 Child process started
MGT.child_exit 0 0.00 Child process normal exit
MGT.child_stop 0 0.00 Child process unexpected exit
MGT.child_died 0 0.00 Child process died (signal)
MGT.child_dump 0 0.00 Child process core dumped
MGT.child_panic 0 0.00 Child process panic
MEMPOOL.vbc.live 24 . In use
MEMPOOL.vbc.pool 10 . In Pool
MEMPOOL.vbc.sz_wanted 88 . Size requested
MEMPOOL.vbc.sz_needed 120 . Size allocated
MEMPOOL.vbc.allocs 19491 0.28 Allocations
MEMPOOL.vbc.frees 19467 0.28 Frees
MEMPOOL.vbc.recycle 19436 0.28 Recycled from pool
MEMPOOL.vbc.timeout 11998 0.17 Timed out from pool
MEMPOOL.vbc.toosmall 0 0.00 Too small to recycle
MEMPOOL.vbc.surplus 0 0.00 Too many for pool
MEMPOOL.vbc.randry 55 0.00 Pool ran dry
MEMPOOL.busyobj.live 6 . In use
MEMPOOL.busyobj.pool 9 . In Pool
MEMPOOL.busyobj.sz_wanted 65536 . Size requested
MEMPOOL.busyobj.sz_needed 65568 . Size allocated
MEMPOOL.busyobj.allocs 1298643 18.39 Allocations
MEMPOOL.busyobj.frees 1298637 18.39 Frees
MEMPOOL.busyobj.recycle 1298436 18.39 Recycled from pool
MEMPOOL.busyobj.timeout 41750 0.59 Timed out from pool
MEMPOOL.busyobj.toosmall 0 0.00 Too small to recycle
MEMPOOL.busyobj.surplus 0 0.00 Too many for pool
MEMPOOL.busyobj.randry 207 0.00 Pool ran dry
MEMPOOL.req0.live 4 . In use
MEMPOOL.req0.pool 9 . In Pool
MEMPOOL.req0.sz_wanted 65536 . Size requested
MEMPOOL.req0.sz_needed 65568 . Size allocated
MEMPOOL.req0.allocs 423162 5.99 Allocations
MEMPOOL.req0.frees 423158 5.99 Frees
MEMPOOL.req0.recycle 423143 5.99 Recycled from pool
MEMPOOL.req0.timeout 36313 0.51 Timed out from pool
MEMPOOL.req0.toosmall 0 0.00 Too small to recycle
MEMPOOL.req0.surplus 0 0.00 Too many for pool
MEMPOOL.req0.randry 19 0.00 Pool ran dry
MEMPOOL.sess0.live 4 . In use
MEMPOOL.sess0.pool 9 . In Pool
MEMPOOL.sess0.sz_wanted 384 . Size requested
MEMPOOL.sess0.sz_needed 416 . Size allocated
MEMPOOL.sess0.allocs 21655 0.31 Allocations
MEMPOOL.sess0.frees 21651 0.31 Frees
MEMPOOL.sess0.recycle 21642 0.31 Recycled from pool
MEMPOOL.sess0.timeout 10076 0.14 Timed out from pool
MEMPOOL.sess0.toosmall 0 0.00 Too small to recycle
MEMPOOL.sess0.surplus 0 0.00 Too many for pool
MEMPOOL.sess0.randry 13 0.00 Pool ran dry
MEMPOOL.req1.live 6 . In use
MEMPOOL.req1.pool 9 . In Pool
MEMPOOL.req1.sz_wanted 65536 . Size requested
MEMPOOL.req1.sz_needed 65568 . Size allocated
MEMPOOL.req1.allocs 418423 5.93 Allocations
MEMPOOL.req1.frees 418417 5.93 Frees
MEMPOOL.req1.recycle 418406 5.93 Recycled from pool
MEMPOOL.req1.timeout 35924 0.51 Timed out from pool
MEMPOOL.req1.toosmall 0 0.00 Too small to recycle
MEMPOOL.req1.surplus 0 0.00 Too many for pool
MEMPOOL.req1.randry 17 0.00 Pool ran dry
MEMPOOL.sess1.live 6 . In use
MEMPOOL.sess1.pool 10 . In Pool
MEMPOOL.sess1.sz_wanted 384 . Size requested
MEMPOOL.sess1.sz_needed 416 . Size allocated
MEMPOOL.sess1.allocs 21659 0.31 Allocations
MEMPOOL.sess1.frees 21653 0.31 Frees
MEMPOOL.sess1.recycle 21645 0.31 Recycled from pool
MEMPOOL.sess1.timeout 10040 0.14 Timed out from pool
MEMPOOL.sess1.toosmall 0 0.00 Too small to recycle
MEMPOOL.sess1.surplus 0 0.00 Too many for pool
MEMPOOL.sess1.randry 14 0.00 Pool ran dry
SMA.s0.c_req 1349644 19.11 Allocator requests
SMA.s0.c_fail 0 0.00 Allocator failures
SMA.s0.c_bytes 22210720975 314541.53 Bytes allocated
SMA.s0.c_freed 19148751042 271178.83 Bytes freed
SMA.s0.g_alloc 105992 . Allocations outstanding
SMA.s0.g_bytes 3061969933 . Bytes outstanding
SMA.s0.g_space 2306739187 . Bytes available
SMA.Transient.c_req 1343403 19.02 Allocator requests
SMA.Transient.c_fail 0 0.00 Allocator failures
SMA.Transient.c_bytes 24207322266 342816.79 Bytes allocated
SMA.Transient.c_freed 24201619786 342736.04 Bytes freed
SMA.Transient.g_alloc 7499 . Allocations outstanding
SMA.Transient.g_bytes 5702480 . Bytes outstanding
SMA.Transient.g_space 0 . Bytes available
VBE.backend1([IP]).vcls 1 . VCL references
VBE.backend1([IP]).happy 18446744073709551615 . Happy health probes
VBE.backend1([IP]).bereq_hdrbytes 173320400 2454.51 Request header bytes
VBE.backend1([IP]).bereq_bodybytes 238971 3.38 Request body bytes
VBE.backend1([IP]).beresp_hdrbytes 124704577 1766.03 Response header bytes
VBE.backend1([IP]).beresp_bodybytes 19209840560 272043.97 Response body bytes
VBE.backend1([IP]).pipe_hdrbytes 14288 0.20 Pipe request header bytes
VBE.backend1([IP]).pipe_out 8069 0.11 Piped bytes to backend
VBE.backend1([IP]).pipe_in 335893 4.76 Piped bytes from backend
VBE.backend2([IP]).vcls 1 . VCL references
VBE.backend2([IP]).happy 18446744073709551615 . Happy health probes
VBE.backend2([IP]).bereq_hdrbytes 173379423 2455.35 Request header bytes
VBE.backend2([IP]).bereq_bodybytes 76962 1.09 Request body bytes
VBE.backend2([IP]).beresp_hdrbytes 124652416 1765.29 Response header bytes
VBE.backend2([IP]).beresp_bodybytes 18690565655 264690.15 Response body bytes
VBE.backend2([IP]).pipe_hdrbytes 14629 0.21 Pipe request header bytes
VBE.backend2([IP]).pipe_out 8558 0.12 Piped bytes to backend
VBE.backend2([IP]).pipe_in 284168 4.02 Piped bytes from backend
VBE.backend3([IP]).vcls 1 . VCL references
VBE.backend3([IP]).happy 18446744073709551615 . Happy health probes
VBE.backend3([IP]).bereq_hdrbytes 173448768 2456.33 Request header bytes
VBE.backend3([IP]).bereq_bodybytes 75294 1.07 Request body bytes
VBE.backend3([IP]).beresp_hdrbytes 124641060 1765.13 Response header bytes
VBE.backend3([IP]).beresp_bodybytes 18738758550 265372.64 Response body bytes
VBE.backend3([IP]).pipe_hdrbytes 17940 0.25 Pipe request header bytes
VBE.backend3([IP]).pipe_out 16704 0.24 Piped bytes to backend
VBE.backend3([IP]).pipe_in 301836 4.27 Piped bytes from backend
VBE.backend4([IP]).vcls 1 . VCL references
VBE.backend4([IP]).happy 18446744073709551615 . Happy health probes
VBE.backend4([IP]).bereq_hdrbytes 173265357 2453.73 Request header bytes
VBE.backend4([IP]).bereq_bodybytes 227023 3.22 Request body bytes
VBE.backend4([IP]).beresp_hdrbytes 124724341 1766.31 Response header bytes
VBE.backend4([IP]).beresp_bodybytes 18642562615 264010.35 Response body bytes
VBE.backend4([IP]).pipe_hdrbytes 22537 0.32 Pipe request header bytes
VBE.backend4([IP]).pipe_out 12367 0.18 Piped bytes to backend
VBE.backend4([IP]).pipe_in 383919 5.44 Piped bytes from backend
LCK.sma.creat 2 0.00 Created locks
LCK.sma.destroy 0 0.00 Destroyed locks
LCK.sma.locks 5272603 74.67 Lock Operations
LCK.hcb.locks 837080 11.85 Lock Operations
LCK.hcl.creat 0 0.00 Created locks
LCK.hcl.destroy 0 0.00 Destroyed locks
LCK.hcl.locks 0 0.00 Lock Operations
LCK.vcl.creat 1 0.00 Created locks
LCK.vcl.destroy 0 0.00 Destroyed locks
LCK.vcl.locks 2604799 36.89 Lock Operations
LCK.sess.creat 43306 0.61 Created locks
LCK.sess.destroy 43304 0.61 Destroyed locks
LCK.sess.locks 4765 0.07 Lock Operations
LCK.wstat.creat 1 0.00 Created locks
LCK.wstat.destroy 0 0.00 Destroyed locks
LCK.wstat.locks 3421304 48.45 Lock Operations
LCK.wq.locks 6449131 91.33 Lock Operations
LCK.objhdr.creat 447638 6.34 Created locks
LCK.objhdr.destroy 387644 5.49 Destroyed locks
LCK.objhdr.locks 42615452 603.51 Lock Operations
LCK.exp.creat 1 0.00 Created locks
LCK.exp.destroy 0 0.00 Destroyed locks
LCK.exp.locks 4462106 63.19 Lock Operations
LCK.lru.creat 2 0.00 Created locks
LCK.lru.destroy 0 0.00 Destroyed locks
LCK.lru.locks 4259219 60.32 Lock Operations
LCK.cli.creat 1 0.00 Created locks
LCK.cli.destroy 0 0.00 Destroyed locks
LCK.cli.locks 23549 0.33 Lock Operations
LCK.ban.creat 1 0.00 Created locks
LCK.ban.destroy 0 0.00 Destroyed locks
LCK.ban.locks 1594008 22.57 Lock Operations
LCK.vbp.creat 1 0.00 Created locks
LCK.vbp.destroy 0 0.00 Destroyed locks
LCK.vbp.locks 112922 1.60 Lock Operations
LCK.backend.locks 2626872 37.20 Lock Operations
LCK.vcapace.creat 1 0.00 Created locks
*由于邮件限制，必须从日志中删除一些（平稳的部分）。
在此我通过client_req计算了“其他不可缓存的请求” - （cache_hit + cache_hitpass + cache_miss）= 436880.这与未缓存的cache_hitpass和缓存未命中（或者只是client_req-cache-hit）一起带来总数至586699，或约18.7％。如果他们的请求很重，我想这可以解释流量。但我有点不相信。
答案 0 :(得分：0)
您是否尝试查看其中一台服务器的访问日志？也许你有要求不通过Varnish进入？
另外，我知道至少在Varnish 3中，缓存命中率是根据可以来自缓存的命中来计算的。例如，使用标准配置时，不会在此计算POST请求。
访问日志可能会给你一些见解......