From: "Matt Carlson" <[EMAIL PROTECTED]> Date: Fri, 09 Nov 2007 16:39:01 -0800
> Previous devices hardcoded the PCI Maximum Read Request Size to 4K. To > better comply with the PCI spec, the hardware now defaults the MRRS to > 512 bytes. This will yield poor driver performance if left untouched. > This patch increases the MRRS to 4K on driver initialization. > > Signed-off-by: Matt Carlson <[EMAIL PROTECTED]> > Signed-off-by: Michael Chan <[EMAIL PROTECTED]> I've applied this patch, but... I sense that the PCI spec wants devices to use an MRRS value of 512 in order to get better fairness on a PCI-E segment amongst multiple devices. >From that perspective, jacking up the MRRS to 4096 unilaterally seems like a very bad idea. If this was necessary for good performance, I'm sure the PCI spec folks would have choosen a higher value. Or is this some tg3 specific performance issue? - 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
