topic Re: packet size in General Topics

packet size

simsim — Tue, 02 Jul 2019 06:45:33 GMT

Hi,

How the packet size impact throughput .

Why do we require higher throughput when the packet size is small.

How do we identify the packet size during the poc time ?

which service will be using the smaller packet size ?

Thanks

Re: packet size

Abdul_Razaq — Wed, 03 Jul 2019 05:46:06 GMT

Hi @simsim ,

To make it simple, smaller packet size means the whole chunk of data into smaller packets, and need to add l2/l3 headers for each.

example

for transferring 900Mb of actual data we need to transfer 100 Mb of headers. considering the link speed, 1 Gbps, per second only 900Mb is transfered ( less throughput)

If the packet size is high, we need only less number of l2/l3 headers, may be 980 Mb data need 20Mb header, which gives higher actual throughput.

You can check MTU of patch using ICMP packet with df bit set.

Usually voice packets will be smaller.

Re: packet size

simsim — Wed, 03 Jul 2019 05:33:27 GMT

Hi,

I did not get the below point

"for transferring 900MB of actual data we need to transfer 100 MB of headers. considering the link speed, 1 GBps, per second only 900MB is transfered ( less throughput)"

Thanks

Re: packet size

Abdul_Razaq — Wed, 03 Jul 2019 05:52:37 GMT

Hi @simsim ,

I was just giving an analogy ( please dont consider Byte or bit difference or interframe gap).

i was just conveying that if your actual data is packed to smaller packet size, you need to have overhead for all, all togather matching to link speed. so actual data transferred will be lower. But if you have bigger packet size, the number of packet will be less, you need header for all (header size will be the same regardless of data size). so you can transfer more data at a given time.

Usually packet per second will be almost same for one platform for any packet size, which gives more data transfer for bigger packets.