Commit 288ac524 authored by Heiner Kallweit's avatar Heiner Kallweit Committed by David S. Miller

r8169: disable default rx interrupt coalescing on RTL8168

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: a99790bf ("r8169: Reinstate ASPM Support")
Reported-by: default avatarMike Crowe <mac@mcrowe.com>
Signed-off-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 22bdf7d4
...@@ -5460,7 +5460,7 @@ static void rtl_hw_start_8168(struct rtl8169_private *tp) ...@@ -5460,7 +5460,7 @@ static void rtl_hw_start_8168(struct rtl8169_private *tp)
tp->cp_cmd |= PktCntrDisable | INTT_1; tp->cp_cmd |= PktCntrDisable | INTT_1;
RTL_W16(tp, CPlusCmd, tp->cp_cmd); RTL_W16(tp, CPlusCmd, tp->cp_cmd);
RTL_W16(tp, IntrMitigate, 0x5151); RTL_W16(tp, IntrMitigate, 0x5100);
/* Work around for RxFIFO overflow. */ /* Work around for RxFIFO overflow. */
if (tp->mac_version == RTL_GIGA_MAC_VER_11) { if (tp->mac_version == RTL_GIGA_MAC_VER_11) {
......
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