Bill Fink wrote:
On Thu, 23 Aug 2007, Rick Jones wrote:
jamal wrote:
[TSO already passed - iirc, it has been
demostranted to really not add much to throughput (cant improve much
over closeness to wire speed) but improve CPU utilization].
In the one gig space sure, but in the 10 Gig space, TSO on/off does make a
difference for throughput.
Not too much.
TSO enabled:
[EMAIL PROTECTED] ~]# ethtool -k eth2
Offload parameters for eth2:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on
[EMAIL PROTECTED] ~]# nuttcp -w10m 192.168.88.16
11813.4375 MB / 10.00 sec = 9906.1644 Mbps 99 %TX 80 %RX
TSO disabled:
[EMAIL PROTECTED] ~]# ethtool -K eth2 tso off
[EMAIL PROTECTED] ~]# ethtool -k eth2
Offload parameters for eth2:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: off
[EMAIL PROTECTED] ~]# nuttcp -w10m 192.168.88.16
11818.2500 MB / 10.00 sec = 9910.0176 Mbps 100 %TX 78 %RX
Pretty negligible difference it seems.
Leaves one wondering how often more than one segment was sent to the card in the
9000 byte case :)
rick jones
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
