Re: em device hangs on ifconfig alias ...

Atanas wrote:

Dan Nelson said the following on 6/28/06 3:52 PM:

In the last episode (Jun 28), User Freebsd said:

has anyone figured out why the em device 'hangs' for about 30-45
seconds whenever you ifconfig alias a new IP on to the device?


The em driver resets the card when you add an IP to it, and unless
you've configured your switch not to autodetect fancy features on that
port, it may very well take 45 seconds for it to come up.

For me the em reset actually takes about a second or so per single IP alias. But more aliases you got, longer the timeout becomes. In case you have hundreds (like I do), a single reboot might cost you something like 10-15 minutes of downtime, just for the aliases to come up.
Does anybody know a better NIC driver alternative when dealing with lots of IP aliases?


Regards,
Atanas

_______________________________________________

For me its IP alias additions take 1 or maybe 2secs, but it is noticeable, but really isn't an issue for me.

As far as I have noticed the em driver in 6.1 after being rebuilt is at its peak of driver quality, so much in fact that since 6.1 its recommended not to even bother with polling with em if you need maximum network performance as it won't go any faster, the em driver for 6.1 got very large performance improvement compared to older em driver versions before 6.1-release, which I suspect got over hacked over time.
I am pretty sure I used to only be able to get 200,300mbits/sec max but now I can get up to 850mbits on some and on the lowest side 500mbits/sec on others which I suspect is due to cable quality etc.
I am just thankful for it working as it is.

Mike


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