Re: alignment faults in 3.6
flat view
From: Maxime Bizon <hidden>
Date: 2012-10-11 10:56:10
Also in:
linux-arm-kernel
Possibly related (same subject, not in this thread)
- 2012-10-12 · alignment faults in 3.6 · Ben Hutchings <hidden>
- 2012-10-12 · alignment faults in 3.6 · David Laight <hidden>
- 2012-10-12 · alignment faults in 3.6 · Ben Hutchings <hidden>
- 2012-10-12 · alignment faults in 3.6 · bcrl@kvack.org (Benjamin LaHaise)
- 2012-10-12 · alignment faults in 3.6 · Eric Dumazet <hidden>
On Thu, 2012-10-11 at 12:49 +0200, Eric Dumazet wrote:
So if you have an alignment fault, thats because IP header is not aligned on 4 bytes ? If so a driver is buggy and must be fixed.
So a driver that does not align the ip header is buggy ? I always thought it was ok not to do so (with a potential performance penalty). I have some MIPS hardware that is not able to DMA on anything but 32bits aligned addresses (bcm63xx). I tried once to add a memcpy instead of taking unaligned faults and the result was *much slower* on a ipv4 forwarding test (which is what the hardware is used for). -- Maxime