On 6/26/11, Gordon Messmer <yinyang at eburg.com> wrote: > On 06/25/2011 01:13 PM, Emmanuel Noobadmin wrote: >> The results were unexpected. The higher the MTU on the sending NIC, >> the lower the file transfer speed. > > What kind of switch are you using? If your switches don't support large > packets, you'll also see slowdowns like that. It's a 3Com 2920 now known as HP V1910 switch. Jumbo frames up to 10K is supposed to be supported.