netdev - Fw: [Bug 213123] New: The performance deteriorates because the ip

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Message-ID: <20210518105735.4f4f7eeb@hermes.local>
Date:   Tue, 18 May 2021 10:57:35 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     netdev@...r.kernel.org
Subject: Fw: [Bug 213123] New: The performance deteriorates because the
 ip_victor function is deleted.

Begin forwarded message:

Date: Tue, 18 May 2021 07:31:29 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: stephen@...workplumber.org
Subject: [Bug 213123] New: The performance deteriorates because the ip_victor function is deleted.

https://bugzilla.kernel.org/show_bug.cgi?id=213123

            Bug ID: 213123
           Summary: The performance deteriorates because the ip_victor
                    function is deleted.
           Product: Networking
           Version: 2.5
    Kernel Version: 4.19.90
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IPV4
          Assignee: stephen@...workplumber.org
          Reporter: kircherlike@...look.com
        Regression: No

In the 4.19 kernel, we see that there is this commit

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/ipv4/ip_fragment.c?id=86e93e470cadedda9181a2bd9aee1d9d2e5e9c0f 

Before the integration, the ip_victor function is used to release the old
fragmented data when the fragmented IP data occupies the fragmented buffer.

However, in the same scenario, the kernel of 4.19 discards all subsequent data
until the 30-second buffer wait time set by ipfrag_time expires.
After this, subsequent fragmented data is received.

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