> -----Original Message----- > From: Måns Rullgård [mailto:mans@xxxxxxxxx] > Sent: Saturday, November 20, 2010 12:02 AM > To: Santosh Shilimkar > Cc: linux-omap@xxxxxxxxxxxxxxx; nm@xxxxxx; mans@xxxxxxxxx; > tony@xxxxxxxxxxx; khilman@xxxxxxxxxxxxxxxxxxx; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx > Subject: Re: [PATCH 5/5] omap4: l2x0: Enable early BRESP bit > > Santosh Shilimkar <santosh.shilimkar@xxxxxx> writes: > > > The AXI protocol specifies that the write response can only > > be sent back to an AXI master when the last write data has been > > accepted. This optimization enables the PL310 to send the write > > response of certain write transactions as soon as the store buffer > > accepts the write address. This behavior is not compatible with > > the AXI protocol and is disabled by default. You enable this > > optimization by setting the Early BRESP Enable bit in the > > Auxiliary Control Register (bit [30]). > > Did you measure the performance difference this makes, if any? > I didn't do any special runs for this bit alone. Just checked with hardware team and they confirmed that you would gain a bit on writes and it's good to enable it. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
