В понеделник, 14 декември 2020 г., 15:46:50 Гринуич+2, Patrick Bégou написа:
Hi,
I’m deploying a CentOS8 (not stream
Hi Strahil
I get:
ping: local error: Message too long, mtu=2044
ping: local error: Message too long, mtu=2044
so ip report is correct and nmcli did not the job ?
Patrick
Le 14/12/2020 à 20:23, Strahil Nikolov via CentOS a écrit :
seems so
2044 is what you get with DATAGRAM mode and the native IB running with
2K packages. You can get 4092 IPoIB MTU with 4K IB. And you do want to run 4K native IB in general.
To run 64K MTU you need to switch from DATAGRAM mode to CONNECTED mode for IPoIB. CONNECTED mode give the highest single stream bandwidth typically but may not give best overall performance (vs 4092 DATAGRAM
mode).
4 thoughts on - MTU Report Question
what happens when you ‘ping -M do -s 65000 -c 4 ?
Best Regards, Strahil Nikolov
В понеделник, 14 декември 2020 г., 15:46:50 Гринуич+2, Patrick Bégou написа:
Hi,
I’m deploying a CentOS8 (not stream
Hi Strahil
I get:
ping: local error: Message too long, mtu=2044
ping: local error: Message too long, mtu=2044
so ip report is correct and nmcli did not the job ?
Patrick
Le 14/12/2020 à 20:23, Strahil Nikolov via CentOS a écrit :
seems so
2044 is what you get with DATAGRAM mode and the native IB running with
2K packages. You can get 4092 IPoIB MTU with 4K IB. And you do want to run 4K native IB in general.
To run 64K MTU you need to switch from DATAGRAM mode to CONNECTED mode for IPoIB. CONNECTED mode give the highest single stream bandwidth typically but may not give best overall performance (vs 4092 DATAGRAM
mode).
Cheers, Peter K