Re: [PATCH v2] net: Do not enable tx-nocache-copy by default

[David Miller]

From: Benjamin Poirier <bpoirier@xxxxxxx>
Date: Tue,  7 Jan 2014 10:11:10 -0500

> There are many cases where this feature does not improve performance or even
> reduces it.
> 
> For example, here are the results from tests that I've run using 3.12.6 on one
> Intel Xeon W3565 and one i7 920 connected by ixgbe adapters. The results are
> from the Xeon, but they're similar on the i7. All numbers report the
> mean±stddev over 10 runs of 10s.
> 
> 1) latency tests similar to what is described in "c6e1a0d net: Allow no-cache
> copy from user on transmit"
> There is no statistically significant difference between tx-nocache-copy
> on/off.
> nic irqs spread out (one queue per cpu)
 ...
> CC: Tom Herbert <therbert@xxxxxxxxxx>
> Signed-off-by: Benjamin Poirier <bpoirier@xxxxxxx>

Looks good, applied, thanks.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/