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Date: Sat, 30 Mar 2013 13:42:56 +0100 From: Francois Romieu <romieu@...zoreil.com> To: hayeswang <hayeswang@...ltek.com> Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, bowgotsai@...gle.com, "'Ryankao'" <ryankao@...ltek.com> Subject: Re: r8169 auto speed down issue hayeswang <hayeswang@...ltek.com> : [...] > Sorry for my unclear descriptor. I just think a case that the nic suspends or > shutdowns without cable plugging. Then, the cable is plugged again. If the nic > speed down to 10M and the link partner force 100M, the issue appears again. If > the nic doesn't speed down for normal link partner, it requires more power > when the linking recovers. Yes. The nic can not guess what the user values most: power saving in a stable link layer configuration vs ability to detect and adapt to a yet unseen configuration. It could be a reason why EEE exists. > Finally, I determine to set the speed to 10M when the link partner supports > 10M. And for the other case, setting the speed to 100M. This avoids the giga > nic to keep the speed to 1000M, and could fix this issue. > However, I wonder if there is a switch which forces the speed to giga. We can check if the partner supports 100M too. It's almost free and it will avoid this problem. -- Ueimor -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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