netdev - RE: [PATCH] e1000e: Disable TSO for buffer overrun workaround

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Date:   Thu, 21 May 2020 07:18:28 +0000
From:   "Brown, Aaron F" <aaron.f.brown@...el.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        "Neftin, Sasha" <sasha.neftin@...el.com>,
        Dima Ruinskiy <dima.ruinskiy@...el.com>,
        "Avargil, Raanan" <raanan.avargil@...el.com>,
        "moderated list:INTEL ETHERNET DRIVERS" 
        <intel-wired-lan@...ts.osuosl.org>,
        "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] e1000e: Disable TSO for buffer overrun workaround

> From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org> On
> Behalf Of Kai-Heng Feng
> Sent: Thursday, May 7, 2020 7:21 AM
> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>
> Cc: Kai-Heng Feng <kai.heng.feng@...onical.com>; David S. Miller
> <davem@...emloft.net>; Neftin, Sasha <sasha.neftin@...el.com>; Dima
> Ruinskiy <dima.ruinskiy@...el.com>; Avargil, Raanan
> <raanan.avargil@...el.com>; moderated list:INTEL ETHERNET DRIVERS <intel-
> wired-lan@...ts.osuosl.org>; open list:NETWORKING DRIVERS
> <netdev@...r.kernel.org>; open list <linux-kernel@...r.kernel.org>
> Subject: [PATCH] e1000e: Disable TSO for buffer overrun workaround
> 
> 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.
> 
> 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@...onical.com>
> ---
>  drivers/net/ethernet/intel/e1000e/netdev.c | 4 ++++
>  1 file changed, 4 insertions(+)
Tested-by: Aaron Brown <aaron.f.brown@...el.com>