Date: Thu, 25 Oct 2007 14:09:04 +0100 From: Tom Judge <tom@tomjudge.com> To: Garrett Cooper <youshi10@u.washington.edu> Cc: net@freebsd.org Subject: Re: Marvell chipsets on 8-CURRENT and XP x64 won't talk with one another Message-ID: <47209570.20609@tomjudge.com> In-Reply-To: <47202922.3070700@u.washington.edu> References: <A47860E0-1E9E-46B2-AFB4-7FE3DF7911C9@u.washington.edu> <20071019182349.J97691@odysseus.silby.com> <47194EA1.8000402@u.washington.edu> <20071019212012.C97691@odysseus.silby.com> <47202922.3070700@u.washington.edu>
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Garrett Cooper wrote: > Mike Silbersack wrote: >> >> On Fri, 19 Oct 2007, Garrett Cooper wrote: >> >>>> Just to clarify, how are the two hooked together? Is it over >>>> gigabit switch, a 10mbps hub, or directly cabled together? >>>> >>>> -Mike >>> >>> Sure. They're both connected over a gigabit switch, but the Windows >>> driver's kind of sketchy because it keeps on switching between >>> 100MBit and 1GBit. I haven't really paid that much attention to what >>> speed the FreeBSD msk driver is registering at. >>> -Garrett >> >> Ah ha! >> >> I had the flopping between 100mbps and 1gbps problem with some Intel >> cards once - some of the machines in the lab were fine, others kept >> switching back and forth. We eventually narrowed it down to the >> cables we had hand-made; some of them just weren't up to snuff, and >> the NIC apparently decided that it had to go back down to 100. >> >> I think you should switch your gigabit switch out for a 100mbps switch >> and see if the network becomes more reliable. >> >> -Mike > > I think I've discovered what the issue is. I believe the problem lies > in the fact that the FreeBSD Marvell chipset driver (msk) isn't up to > speed with the Gigabit transferring on my particular chipset(s). That's > why transfers were most likely working with my laptop (Apple with > 100MBit Broadcom) vs my desktop (Asus MB with another Marvell chipset > driver) and another laptop (Dell laptop with Broadcom Gigabit). > How do I tell ifconfig via rc.conf to downgrade the max speed to > 100MBit duplex? > Thanks, > -Garrett You would need to hard code the interface configuration on the switch and box. This is only possible if you have a managed switch and the methods on the switch are manufacturer and model dependent. On FreeBSD however it is trivial for example "ifconfig em0 media 100baseTX mediaopt full-duplex". This will disable speed negotiation and therefore must be configured at both ends of the link. Tom
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