Date: Tue, 29 Apr 2008 17:43:42 +0530 From: Sharad Chandra <sharadc@in.niksun.com> To: Jeremy Chadwick <koitsu@freebsd.org> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: jumbo packets on em card. Message-ID: <200804291743.43010.sharadc@in.niksun.com> In-Reply-To: <20080429120209.GA44534@eos.sc1.parodius.com> References: <200804291613.14081.sharadc@in.niksun.com> <20080429120209.GA44534@eos.sc1.parodius.com>
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,---- [Jeremy Chadwick wrote:] | On Tue, Apr 29, 2008 at 04:13:13PM +0530, Sharad Chandra wrote: | > I am getting a problem in setting em card to 1000baseTX. It shows "active | > status" with 100baseTX but as soon as i run "ifconfig em1 media | > 1000baseTX mediaopt full-duplex", it says *no carrier*. how can i set it | > to 1000base? | | The PHYs support auto-negotiation of speed and duplex, as per the 802.3 | standard. | | Do you have a gigabit switch? If so, does auto-negotiation (e.g. no | "mediaopt" or "media" settings) work? If not, is the switch a managed | switch? If so, try explicitly setting the port on the switch to | 1000mbit, full duplex. If not, then consider buying another switch. | Many consumer/residential switches do not do auto-negotiation properly, | resulting in "no carrier" or worse (bad throughput). No, I am not using any switch. It is back-to-back connection. It is only requirement for me. | | > And is it possible any how to send *jumbo packets* on this card or on bge | > card (bge card is working with 1000base)? I tried nemesis tool, but i | > don't think it can send bigger packets. BPF also seems to have limitaion | > upto 2K. | | man 4 em | man 4 bge | | Keep in mind that if you use jumbo frames, your **entire network** needs | to use jumbo frames. You cannot mix-and-match frame sizes. Chances are | your ISPs or your co-lo provider doesn't support jumbo. -- `---- -- Thanks Sharad Chandra
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