From: Kai-Heng Feng kai.heng.feng@canonical.com
Commit b10effb92e27 ("e1000e: fix buffer overrun while the I219 is processing DMA transactions") imposes roughly 30% performance penalty.
The commit log states that "Disabling TSO eliminates performance loss for TCP traffic without a noticeable impact on CPU performance", so let's disable TSO by default to regain the loss.
CC: stable stable@vger.kernel.org Fixes: b10effb92e27 ("e1000e: fix buffer overrun while the I219 is processing DMA transactions") BugLink: https://bugs.launchpad.net/bugs/1802691 Signed-off-by: Kai-Heng Feng kai.heng.feng@canonical.com Tested-by: Aaron Brown aaron.f.brown@intel.com Signed-off-by: Jeff Kirsher jeffrey.t.kirsher@intel.com --- drivers/net/ethernet/intel/e1000e/netdev.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index e0b074820b47..66609cf689de 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -5294,6 +5294,10 @@ static void e1000_watchdog_task(struct work_struct *work) /* oops */ break; } + if (hw->mac.type == e1000_pch_spt) { + netdev->features &= ~NETIF_F_TSO; + netdev->features &= ~NETIF_F_TSO6; + } }
/* enable transmits in the hardware, need to do this