On Thu, Jul 5, 2018 at 8:01 PM Kaushal Shriyan <kaushalshri...@gmail.com>
wrote:
>
>
> On Thu, Jul 5, 2018 at 7:18 PM Jeffrey Lane <j...@canonical.com> wrote:
>
>> On Thu, Jul 5, 2018 at 5:07 AM, Sandro Bureca <sbur...@gmail.com> wrote:
>> > For linux the following command can be used:
>> >
>> > cat /sys/class/net/eth0/statistics/rx_packets
>> > cat /sys/class/net/eth0/statistics/tx_packets
>>
>> Or you could just do this:
>>
>> watch -n1 netstat -ni
>>
>> Also, if you're looking to see what cores are being hammered during
>> processing:
>>
>> cat /proc/interrupts and look for lines matching your device (if present):
>>
>> 139: 37 0 0 0 0
>> 0 4605821 0 IR-PCI-MSI 1048576-edge enp2s0
>> 140: 0 2328 0 0 42268740
>> 0 0 0 IR-PCI-MSI 1048577-edge enp2s0-TxRx-0
>> 141: 0 0 243 0 0
>> 0 0 1650980 IR-PCI-MSI 1048578-edge enp2s0-tx-1
>> 142: 0 0 0 8748551 0
>> 0 0 0 IR-PCI-MSI 1048579-edge enp2s0-tx-2
>> 143: 0 0 0 0 189
>> 1341058 0 0 IR-PCI-MSI 1048580-edge
>> enp2s0-tx-3
>>
>> That's for an 8 core Skylake CPU on my desktop.
>>
>> Something like this will let you see it in 1 second intervals to see
>> which core is getting the interrupts during network stuff:
>>
>> watch -n1 "cat /proc/interrupts | grep enp2s0"
>>
>> YMMV and all that.
>>
>
>
> Thanks Jeff and Sandro Bureca for the reply.
>
> [ec2-user@ip-172-31-11-0 ~]$ cat /sys/class/net/eth0/statistics/rx_packets
> 1520936 -> Does it mean 1520936 packets? if it reports 1 does it mean 1
> packet?
> [ec2-user@ip-172-31-11-0 ~]$ cat /sys/class/net/eth0/statistics/tx_packets
> 1135781 -> Does it mean 1135781 packets? if it reports 1 does it mean 1
> packet?
> [ec2-user@ip-172-31-11-0 ~]$
>
>
> watch -n1 netstat -ni
>
> Every 1.0s: netstat -ni
>
> Thu Jul 5 14:26:03 2018
>
> Kernel Interface table
> Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR
> Flg
> eth0 9001 1520859 0 0 0 1135669 0 0 0 BMRU
> lo 65536 2898393 0 0 0 2898393 0 0 0 LRU
>
> watch -n1 "cat /proc/interrupts | grep eth0"
> Every 1.0s: cat /proc/interrupts | grep eth0
>
> Thu Jul 5 14:25:29 2018
>
> 97: 161 0 0 0 1885854 0
> 0 0 xen-pirq-msi-x eth0-TxRx-0
> 98: 201 0 0 0 0 1613325
> 0 0 xen-pirq-msi-x eth0-TxRx-1
> 99: 54 0 0 0 0 0
> 0 0 xen-pirq-msi-x eth0
>
> I look forward to hearing from you. How do i decide how many CPU cores i
> need? Is there a thumb rule or any calculation to select AWS Instance for
> example. Currently i have selected AWS t2.large instance type as per
> https://aws.amazon.com/ec2/instance-types/ to set up Openswan IPsec VPN
> tunnel without any basis. Correct me if i am wrong?
>
> I look forward to hearing from you
>
> Best Regards,
>
>
Hi ,
I will appreciate if someone can pitch in related to my earlier command
output. Basically i am setting up AWS cloud instance viz how many CPU Cores
to be selected to handle the network traffic. Is there a calculation to
know how many cpu cores are needed for a specific network bandwidth?
Best Regards,
Kaushal
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