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e1000e: Disable TSO for buffer overrun workaround

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Commit b10effb92e ("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: b10effb92e ("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>
This commit is contained in:
Kai-Heng Feng 2020-05-07 22:21:07 +08:00 committed by Jeff Kirsher
parent 0c80cdbf33
commit f29801030a
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/intel/e1000e/netdev.c
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@ -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