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How to fine-tune the ASA interface configuration to minimize packet drop

bensonlei
Level 1
Level 1

Hi, guys,

 

I got the question: One of the ASA interface ( 1G fiber ):


fwcore/sec/act# sh int gi1/0
Interface GigabitEthernet1/0 "users", is up, line protocol is up
  Hardware is i82576F rev01, BW 1000 Mbps, DLY 1000 usec
 (Full-duplex), 1000 Mbps(1000 Mbps)
 Input flow control is unsupported, output flow control is on
 Description: users
 
 86173530 packets input, 33896659673 bytes, 0 no buffer
 Received 34 broadcasts, 0 runts, 0 giants
 .........
 
 129749164 packets output, 129169262455 bytes, 0 underruns
 .........
  Traffic Statistics for "users":
 86173511 packets input, 32096200361 bytes
 129749164 packets output, 126747520525 bytes
 215421 packets dropped
      1 minute input rate 5060 pkts/sec,  3666802 bytes/sec
      1 minute output rate 5168 pkts/sec,  3739753 bytes/sec
      1 minute drop rate, 9 pkts/sec
      5 minute input rate 5055 pkts/sec,  3765713 bytes/sec
      5 minute output rate 4944 pkts/sec,  3616803 bytes/sec
      5 minute drop rate, 8 pkts/sec

 

----------------------------------------

GigabitEthernet1/0:
   Intel i82576F rev01, port id 9
   Subsystem Vendor ID: 0xb20
     Major Configuration Parameters
         Device Name                              : en_igb
         PCI Bus:Dev.Func                         : 11:00.00
         Num of Transmit Rings                    : 1
         Num of Receive Rings                     : 1
         Max Frame Length                         : 1518
         TX Pre-Fetch Threshold (PTHRESH)         : 8
         TX Write-Back Threshold (WTHRESH)        : 16
         TX Host Threshold (HTHRESH)              : 1
         Soft Reset                               : 1
         Link Status                              : UP
         Link Speed                               : 1000Auto

     General Control Registers:
         Device Control (CTRL)                    : 0x00dc1a41
         Device Status (STATUS)                   : 0x00080783
         Extn Device Control (CTRL_EXT)           : 0x10dc0c00
         MDI Control (MDIC)                       : 0x10000000
         SerDes ANA (SERDESCTL)                   : 0x80000400
         Copper/Fiber Switch Control (CONNSW)     : 0x00000600
         VLAN Ether Type (VET)                    : 0x00008100
         LED Control (LEDCTL)                     : 0x07068302

     Packet Buffers Control Registers:
         Receive Packet Buffer Size (RXPBS)       : 64 KBytes
         Transmit Packet Buffer Size (RXPBS)      : 40 KBytes
         Switch Packet Buffer Size (RXPBS)        : 20 KBytes

 

..........................

 

Transmit Ring [0]:
         Control (TXDCTL)      : 0x02100108
         Base Address (TDBAH/L): 00000000-cd1f9000
         Length (TDLEN)        : 8192
         Num of TX Descriptors : 512
         Head/Tail (TDH/TDT)   : 214/214
         Driver Head/Tail      : 214/214
         tx_pkts               : 992549
         tx_bytes              : 1106772432

     Receive Ring [0]:
         Control (RXDCTL)      : 0x02010810
         Split RxCntrl (SRRCTL): 0x720f8002
         Base Address (RDBAH/L): 00000000-cd1fd000
         Length (RDLEN)        : 8192
         Num of RX Descriptors : 512
         Head/Tail (RDH/RDT)   : 459/458
         Driver Head/Tail      : 459/458
         rx_pkts               : 500140
         rx_bytes              : 172422266
         rx_lec                : 0
         num_rxbufs            : 511

 

 

 

 

 

 

1. The interface got around 60Mbps speed, which is low speed utilization compared to 1Gbps interface, what is the reason so many packet dropped ( default QOS configuration ) ?

2. Any way to improve the interface performance ?

 

 

 

 

 

Thankx

 

 

 

 

 

 

 

 

 

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