Chih-Wei Yu writes:
> I'm using TCP connection on the loopback but somehow i am reaching a bottle 
> neck in terms of throughput. I tried to increase MTU size on the loopback:
> 
> $> ifconfig lo0 mtu 16384 
> 
> but i get error indicating invalid arguments.

Correct; the system doesn't allow you to do that.  It won't let you
set the MTU greater than ill_max_frag, which is hard-coded to
IP_LOOPBACK_MTU (8192) for lo0.

How have you determined that the default MTU setting on the lo0
interface is in fact the problem in this instance?

> Its on T2000, solaris 10, patch level 120011-14.

Solaris 10 isn't OpenSolaris.  You should contact Sun's support group
with questions about Solaris 10.

> I see that there is a e1000g.conf in /kernel/drv/ directory but by updating 
> this file will it help with the setting of increasing MTU on the loopback?
> Is there other ways to increase throughput through the loopback? 

'e1000g' is an Ethernet driver.  It has nothing to do with loopback.

-- 
James Carlson, Solaris Networking              <[EMAIL PROTECTED]>
Sun Microsystems / 35 Network Drive        71.232W   Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757   42.496N   Fax +1 781 442 1677
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