From: Tom Lendacky <thomas.lenda...@amd.com> Date: Wed, 28 Oct 2015 08:48:36 -0500
> On 10/27/2015 09:50 PM, David Miller wrote: >> From: Tom Lendacky <thomas.lenda...@amd.com> >> Date: Mon, 26 Oct 2015 17:13:54 -0500 >> >>> During Tx cleanup it's still possible for the descriptor data to be >>> read ahead of the descriptor index. A memory barrier is required >>> between >>> the read of the descriptor index and the start of the Tx cleanup loop. >>> This allows a change to a lighter-weight barrier in the Tx transmit >>> routine just before updating the current descriptor index. >>> >>> Since the memory barrier does result in extra overhead on arm64, keep >>> the previous change to not chase the current descriptor value. This >>> prevents the execution of the barrier for each loop performed. >>> >>> Suggested-by: Alexander Duyck <alexander.du...@gmail.com> >>> Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com> >> >> Applied, thanks. >> > > Thanks David. Could you queue this up for the 4.1 and 4.2 stable > trees? Ok, done. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
