CentOS - Feb 2008 - RE: [Iscsitarget-devel] Performance Question

>Yes, jumbo frames, no irq coalescence, blockio and see if
>you can get Backup Exec to use large io request sizes when
>reading and writing the data. The larger the better.
Ok, Jumbo's enabled on the switch and media server. For the sake of our
sanity jumping back and forth, I am trying to enable jumbo's on the bonded
pair in the target, # ifconfig bond0 mtu 9014 and it errors out? Any idea what I
am doing wrong?

Also, where do I tune irq coalescence?

Thanks!
jlc

Lol, sorry guys :)

Joseph L. Casale wrote:
> 
> >Yes, jumbo frames, no irq coalescence, blockio and see if
> >you can get Backup Exec to use large io request sizes when
> >reading and writing the data. The larger the better.
> 
> Ok, Jumbo's enabled on the switch and media server. For the 
> sake of our sanity jumping back and forth, I am trying to 
> enable jumbo's on the bonded pair in the target, # ifconfig 
> bond0 mtu 9014 and it errors out? Any idea what I am doing wrong?
Yeah, it's MTU 9000 on Linux, Linux adds 14 byte ethernet frame
by default (standard MTU is actually 1514).
> Also, where do I tune irq coalescence?
It can be done through ethtool if the cards are supported,
or sometimes it needs to be done on mod load. Which card?

-Ross

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