Date: Mon, 27 Oct 2008 15:02:18 -0700 From: Chuck Swiger <cswiger@mac.com> To: Eitan Shefi <eitans@mellanox.co.il> Cc: freebsd-net@freebsd.org Subject: Re: It seems that FreeBSD-7.0 does not use the available MTU Message-ID: <1AB022D4-5147-4837-82CC-99270FF45AE5@mac.com> In-Reply-To: <5D49E7A8952DC44FB38C38FA0D758EADCC5FB7@mtlexch01.mtl.com> References: <5D49E7A8952DC44FB38C38FA0D758EADC72E72@mtlexch01.mtl.com> <5D49E7A8952DC44FB38C38FA0D758EADCC5FB7@mtlexch01.mtl.com>
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On Oct 27, 2008, at 2:53 PM, Eitan Shefi wrote: > When I change the MTU to a value greater then 1500, for example 3000, > and then send "ping" with message size 2500, from one host to the > other, > the other host gets more then one ICMP packet, even thaw the message > that was send is match smaller then the MTU. > > I tried to run this test using a different NIC, but I got the same > behavior. You obscured the details of which NICs you actually used, so a guess would be that your hardware doesn't support jumbo frames. If your NIC isn't gigabit-speed capable, this is probably expected-- only fairly new NICs like em/bce/bge/msk have the capability. Regards, -- -Chuck
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