Возможно я не так выразился.

Отдача аудио и видео происходит не с самого сервера.
Начали проксировать аудио и видео.

Вот вроде по мск совсем еще утро, а проблема уже имеет место.
Вотчто показывает stat nginx

Active connections: 1629
server accepts handled requests
24689 24689 99412
Reading: 263 Writing: 515 Waiting: 851

sockets: used 2486
TCP: inuse 6022 orphan 3679 tw 1368 alloc 6023 mem 67236

Памяти еще куча
total used free shared buffers cached
Mem: 4029148 794308 3234840 0 19068 92496
-/+ buffers/cache: 682744 3346404
Swap: 0 0 0

netstat -an | grep -c .
7882

obelisk2 vhosts.d # netstat -s
Ip:
692793382 total packets received
3180 with invalid addresses
0 forwarded
0 incoming packets discarded
692790202 incoming packets delivered
428342555 requests sent out
753 dropped because of missing route
Icmp:
2681 ICMP messages received
29 input ICMP message failed.
ICMP input histogram:
destination unreachable: 308
timeout in transit: 26
echo requests: 2347
2707 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 360
echo replies: 2347
IcmpMsg:
InType3: 308
InType8: 2347
InType11: 26
OutType0: 2347
OutType3: 360
Tcp:
12453168 active connections openings
6177202 passive connection openings
138019 failed connection attempts
1784339 connection resets received
2272 connections established
681156423 segments received
396080190 segments send out
20639670 segments retransmited
0 bad segments received.
2709964 resets sent
Udp:
11619354 packets received
510 packets to unknown port received.
0 packet receive errors
11619993 packets sent
UdpLite:
TcpExt:
136335 resets received for embryonic SYN_RECV sockets
2076666 packets pruned from receive queue because of socket buffer overrun
32299 packets pruned from receive queue
19 packets dropped from out-of-order queue because of socket buffer overrun
1 ICMP packets dropped because they were out-of-window
1752790 TCP sockets finished time wait in fast timer
71576 time wait sockets recycled by time stamp
322320 TCP sockets finished time wait in slow timer
1066405 passive connections rejected because of time stamp
46489 packets rejects in established connections because of timestamp
27138320 delayed acks sent
2079 delayed acks further delayed because of locked socket
Quick ack mode was activated 2503648 times
65040 packets directly queued to recvmsg prequeue.
113098 bytes directly in process context from backlog
32161371 bytes directly received in process context from prequeue
256602048 packet headers predicted
21200 packets header predicted and directly queued to user
137527568 acknowledgments not containing data payload received
93706988 predicted acknowledgments
36793 times recovered from packet loss due to fast retransmit
2462365 times recovered from packet loss by selective acknowledgements
567 bad SACK blocks received
Detected reordering 54490 times using FACK
Detected reordering 99289 times using SACK
Detected reordering 2241 times using reno fast retransmit
Detected reordering 55089 times using time stamp
78370 congestion windows fully recovered without slow start
451531 congestion windows partially recovered using Hoe heuristic
73371 congestion windows recovered without slow start by DSACK
300609 congestion windows recovered without slow start after partial ack
3682594 TCP data loss events
TCPLostRetransmit: 121701
18622 timeouts after reno fast retransmit
1008097 timeouts after SACK recovery
1021548 timeouts in loss state
6001401 fast retransmits
490766 forward retransmits
5956755 retransmits in slow start
2468003 other TCP timeouts
5637 classic Reno fast retransmits failed
414719 SACK retransmits failed
217752311 packets collapsed in receive queue due to low socket buffer
2408550 DSACKs sent for old packets
13729 DSACKs sent for out of order packets
791186 DSACKs received
8870 DSACKs for out of order packets received
984174 connections reset due to unexpected data
890723 connections reset due to early user close
552172 connections aborted due to timeout
TCPSACKDiscard: 33748
TCPDSACKIgnoredOld: 302716
TCPDSACKIgnoredNoUndo: 373425
TCPSpuriousRTOs: 66765
IpExt:
InBcastPkts: 11201


Не понятно чего именно не хватает сервису. Какого ресурса.
Сокетов используется мало.