From: Eric Dumazet <eric.dumazet@gmail.com>
To: Song Liu <songliubraving@fb.com>, Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
netdev <netdev@vger.kernel.org>,
"intel-wired-lan@lists.osuosl.org"
<intel-wired-lan@lists.osuosl.org>,
Kernel Team <Kernel-team@fb.com>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
Alexei Starovoitov <ast@kernel.org>
Subject: Re: [PATCH net] ixgbe: check return value of napi_complete_done()
Date: Thu, 20 Sep 2018 16:49:06 -0700 [thread overview]
Message-ID: <028b4cea-0e3f-fab5-7a74-cf003bbd1134@gmail.com> (raw)
In-Reply-To: <E4A7BD0D-B091-4FBD-94A9-F0104729DCF6@fb.com>
On 09/20/2018 04:43 PM, Song Liu wrote:
>
> I tried to totally skip ndo_poll_controller() here. It did avoid hitting
> the issue. However, netpoll will drop (fail to send) more packets.
>
Why is it failing ?
If you are under high memory pressure, then maybe if you absolutely want memory to send
netpoll packets, you want to grab all NAPI contexts as a way to prevent other cpus
from feeding incoming packets to the host and add more memory pressure ;)
next prev parent reply other threads:[~2018-09-21 5:35 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-20 19:01 [PATCH net] ixgbe: check return value of napi_complete_done() Song Liu
2018-09-20 20:35 ` Eric Dumazet
2018-09-20 21:01 ` Jeff Kirsher
2018-09-20 22:42 ` Song Liu
2018-09-20 23:22 ` Eric Dumazet
2018-09-20 23:43 ` Song Liu
2018-09-20 23:49 ` Eric Dumazet [this message]
2018-09-21 7:17 ` Song Liu
2018-09-21 13:33 ` Eric Dumazet
2018-09-21 14:55 ` Alexei Starovoitov
2018-09-21 14:59 ` Eric Dumazet
2018-09-21 15:14 ` Alexei Starovoitov
2018-09-21 15:43 ` Eric Dumazet
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