Subject: Fw: [Bug 199963] New: UDP rx_queue incorrect calculation in /proc/net/udp

From: Stephen Hemminger <[email-masked]>
Date: Thu, 7 Jun 2018 07:39:18 -0700

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Date: Thu, 07 Jun 2018 13:21:23 +0000
From: [email-masked]
To: [email-masked]
Subject: [Bug 199963] New: UDP rx_queue incorrect calculation in /proc/net/udp

https://bugzilla.kernel.org/show_bug.cgi?id=199963

            Bug ID: 199963
           Summary: UDP rx_queue incorrect calculation in /proc/net/udp
           Product: Networking
           Version: 2.5
    Kernel Version: Kernels >= 4.15
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IPV4
          Assignee: [email-masked]
          Reporter: [email-masked]
        Regression: No

since upgrading to any kernel >= 4.15 the rx_queue in /proc/net/udp is now
reporting a queue, regardless of system load and regardless of what
applications are running on it. The tx_queue is always 0, but rx_queue has
seemingly random spikes of udp queueing. This is observed across hundreds of
servers with either varying or no workload.

netstat -nl|grep ^udp
udp 4352 0 0.0.0.0:68 0.0.0.0:*

sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid
timeout inode ref pointer drops
14645: 3500007F:0035 00000000:0000 07 00000000:0000C900 00:00000000 00000000
101 0 3367 2 ffff8da177fdcc00 0

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