netdev - Re: TCP connection stops after high load.

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Date:	Thu, 12 Apr 2007 22:41:46 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Ben Greear <greearb@...delatech.com>
CC:	Andi Kleen <andi@...stfloor.org>, netdev@...r.kernel.org,
	bcrl@...ck.org
Subject: Re: TCP connection stops after high load.

Ben Greear a écrit :
> Eric Dumazet wrote:
> 
>> What "tc -s -d qdisc"
>> "ifconfig -a"
>> "cat /proc/interrupts" "cat /proc/net/sockstat" and
>> "cat /proc/net/softnet_stat" are telling ?
> 
> 
> In this test, eth2 is talking to eth3, using something similar to this
> send-to-self patch:
> http://www.candelatech.com/oss/sts.patch
> 
> 
> [root@...001-240 ipv4]# ifconfig -a
> eth0      Link encap:Ethernet  HWaddr 00:30:48:89:74:60
>           inet addr:192.168.100.187  Bcast:192.168.100.255  
> Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:1672220 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:1560305 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:151896589 (144.8 MiB)  TX bytes:1375280163 (1.2 GiB)
>           Interrupt:17
> 
> eth1      Link encap:Ethernet  HWaddr 00:30:48:89:74:61
>           UP BROADCAST MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
>           Interrupt:18
> 
> eth2      Link encap:Ethernet  HWaddr 00:07:E9:1F:CE:02
>           inet addr:20.20.20.20  Bcast:20.20.20.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:2175144684 errors:0 dropped:2 overruns:0 frame:0
>           TX packets:2196560123 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:1321380186 (1.2 GiB)  TX bytes:2274982574 (2.1 GiB)
>           Base address:0xd000 Memory:d0000000-d0020000
> 
> eth3      Link encap:Ethernet  HWaddr 00:07:E9:1F:CE:03
>           inet addr:20.20.20.30  Bcast:20.20.20.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:2196315966 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:2174900538 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:2257901986 (2.1 GiB)  TX bytes:1304493504 (1.2 GiB)
>           Base address:0xd100 Memory:d0020000-d0040000
> 
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:1159378 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:1159378 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:1133646590 (1.0 GiB)  TX bytes:1133646590 (1.0 GiB)
> 
> [root@...001-240 ipv4]# tc -s -d qdisc
> qdisc pfifo_fast 0: dev eth0 bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 
> 1 1 1
>  Sent 1367521025 bytes 1324808 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: dev eth1 bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 
> 1 1 1
>  Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: dev eth2 bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 
> 1 1 1
>  Sent 1815657070136 bytes 1536674488 pkt (dropped 0, overlimits 0 
> requeues 1448094)
>  rate 0bit 0pps backlog 0b 0p requeues 1448094
> qdisc pfifo_fast 0: dev eth3 bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 
> 1 1 1
>  Sent 1752033393324 bytes 1536906566 pkt (dropped 0, overlimits 0 
> requeues 1063672)
>  rate 0bit 0pps backlog 0b 0p requeues 1063672
> 
> [root@...001-240 ipv4]# cat /proc/interrupts
>            CPU0       CPU1
>   0:   46020594   44501954    IO-APIC-edge  timer
>   1:          9          0    IO-APIC-edge  i8042
>   7:          0          0    IO-APIC-edge  parport0
>   8:          1          0    IO-APIC-edge  rtc
>   9:          0          0   IO-APIC-level  acpi
>  12:         96          0    IO-APIC-edge  i8042
>  14:     394023     407282    IO-APIC-edge  ide0
>  16:          0          0   IO-APIC-level  uhci_hcd:usb4
>  17:    1134346    1034006   IO-APIC-level  uhci_hcd:usb3, eth0
>  18:      81605      83739   IO-APIC-level  libata, uhci_hcd:usb2, eth1
>  19:          0          0   IO-APIC-level  uhci_hcd:usb1, ehci_hcd:usb5
>  20:   53056128   46598235   IO-APIC-level  eth2
>  21:   47534577   52189674   IO-APIC-level  eth3
> NMI:          0          0
> LOC:   90485383   90485382
> ERR:          0
> MIS:          0
> 
> [root@...001-240 ipv4]# cat /proc/net/sockstat
> sockets: used 334
> TCP: inuse 27 orphan 0 tw 0 alloc 27 mem 360
> UDP: inuse 12
> RAW: inuse 0
> FRAG: inuse 0 memory 0
> 
> [root@...001-240 ipv4]# cat /proc/net/softnet_stat
> d58236f1 00000000 023badc3 00000000 00000000 00000000 00000000 00000000 
> 0004ef01
> 3a4354a1 00000000 01b57b4b 00000000 00000000 00000000 00000000 00000000 
> 0005445f
> 

Hum, could you try to bind nic irqs on separate cpus ?

eth2 -> CPU0 and eth3 -> CPU1

# echo 1 >/proc/irq/20/smp_affinity
# echo 2 >/proc/irq/21/smp_affinity


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