[ Upstream commit 288ac524cf70a8e7ed851a61ed2a9744039dae8d ] It was reported that re-introducing ASPM, in combination with RX interrupt coalescing, results in significantly increased packet latency, see [0]. Disabling ASPM or RX interrupt coalescing fixes the issue. Therefore change the driver's default to disable RX interrupt coalescing. Users still have the option to enable RX coalescing via ethtool.
[0] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=925496 Fixes: a99790bf5c7f ("r8169: Reinstate ASPM Support") Reported-by: Mike Crowe <[email protected]> Signed-off-by: Heiner Kallweit <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- drivers/net/ethernet/realtek/r8169.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c index 1d24884e9897..7a50b911b180 100644 --- a/drivers/net/ethernet/realtek/r8169.c +++ b/drivers/net/ethernet/realtek/r8169.c @@ -5418,7 +5418,7 @@ static void rtl_hw_start_8168(struct rtl8169_private *tp) tp->cp_cmd |= PktCntrDisable | INTT_1; RTL_W16(tp, CPlusCmd, tp->cp_cmd); - RTL_W16(tp, IntrMitigate, 0x5151); + RTL_W16(tp, IntrMitigate, 0x5100); /* Work around for RxFIFO overflow. */ if (tp->mac_version == RTL_GIGA_MAC_VER_11) { -- 2.19.1
