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Message-ID: <20100415095926.GP25086@skl-net.de> Date: Thu, 15 Apr 2010 11:59:26 +0200 From: Steffen Klassert <klassert@...hematik.tu-chemnitz.de> To: Martin Buck <mb-tmp-yvahk-argqri@...mit.dyndns.org> Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] Speedup link loss detection for 3c59x On Thu, Apr 15, 2010 at 11:11:34AM +0200, Martin Buck wrote: > From: Martin Buck <mb-tmp-yvahk-argqri@...mit.dyndns.org> > > Change the timer used for link status checking to check link every 5s, > regardless of the current link state. This way, link loss is detected as > fast as new link, whereas this took up to 60s previously (which is pretty > inconvenient when trying to react on link loss using e.g. ifplugd). This > also matches behaviour of most other Ethernet drivers which typically have > link check intervals in the low second range. > We discussed this issue already some years ago. The 3c59x does polling for external environment changes which is quite expensive. Firing a timer that disables the interrupts on a running interface every 5 seconds is not reasonable for checking for external environment changes. So we decided to let it depend on the link status, 5 seconds if the link is down and 60 seconds if the link is up. Steffen -- 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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