Malcolm Beattie wrote: > Start with > # echo 262144 > /proc/sys/net/core/wmem_max > # echo 262144 > /proc/sys/net/core/rmem_max > to raise the maximum read/write buffer size internally from 64K to 256K.
And you did not even ask whether he's running on VM or not. The virtual machine not being dispatched by CP in time can be a cause for packet loss and require retransmission, in which case a large tcp window might even make you go slower. Given enough competition the same would apply to LPARs with shared CPUs. I'm not sure where your 256K comes from, but I would be very reluctant to spread this kind of rules-of-thumb. I'm afraid QDIO performance turns out to be more complicated than this. Rob
