David Dillow wrote: > On Fri, 2009-06-19 at 11:08 -0500, Victor Lowther wrote: >> Or you can include ethtool and check every half second until a timeout >> to see if the link is back. > > With most switches, you'll get a link back almost immediately, but it > will be in blocking mode and won't transmit your packets for 20-30 > seconds. <And a huge grin spreads over my face> Finally. I'm not alone anymore:-) (I have been fighting the STP issue for years now.) No, no, no. You don't want to add 'just' a sleep here because things don't work as expected. Certainly not in this case. The problem here is that most programs don't / can't distinguish between an EHOSTUNREACH during startup (where we should retry as the link / connection might not be up yet) and an EHOSTUNREACH during normal operation (where we should return the error as this is a genuine error condition). The only safe way here is to send a ping to the host port we're trying to connect to, and limit this with a timeout. And start up the command once the ping succeeds. Otherwise timeout and start error recovery. Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Markus Rex, HRB 16746 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe initramfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
