Re: [CentOS] network copy performance is poor (rsync) - debugging suggestions?

On 01/23/2015 11:10 AM, Valeri Galtsev wrote:

I'm not certain what the problem could be. But enabling jumbo packets would be the fist thing I would try

Jumbo frames are an excellent option if your system is spending a lot of time processing interrupts, which is why I asked about the "hi" value in 'top'. However, jumbo frames aren't free. You have to set the same MTU on ALL of the hardware in a given broadcast domain (LAN). Because of that, you'll typically only see that when interrupt processing has been demonstrated as a cost that needs to be reduced.

In this case, CIFS is performing reasonably well without jumbo frames, so jumbo frames probably won't solve the problem.