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
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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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