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Date:   Wed, 22 May 2019 16:12:30 -0700
From:   Stephen Hemminger <stephen@networkplumber.org>
To:     Sunil Muthuswamy <sunilmut@microsoft.com>
Cc:     KY Srinivasan <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Sasha Levin <sashal@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Dexuan Cui <decui@microsoft.com>,
        Michael Kelley <mikelley@microsoft.com>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net-next] hv_sock: perf: Allow the socket buffer size
 options to influence the actual socket buffers
Message-ID: <20190522161230.7daf840c@xps13.lan>
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On Wed, 22 May 2019 22:56:07 +0000
Sunil Muthuswamy <sunilmut@microsoft.com> wrote:

> Currently, the hv_sock buffer size is static and can't scale to the
> bandwidth requirements of the application. This change allows the
> applications to influence the socket buffer sizes using the SO_SNDBUF and
> the SO_RCVBUF socket options.
> 
> Few interesting points to note:
> 1. Since the VMBUS does not allow a resize operation of the ring size, the
> socket buffer size option should be set prior to establishing the
> connection for it to take effect.
> 2. Setting the socket option comes with the cost of that much memory being
> reserved/allocated by the kernel, for the lifetime of the connection.
> 
> Perf data:
> Total Data Transfer: 1GB
> Single threaded reader/writer
> Results below are summarized over 10 iterations.
> 
> Linux hvsocket writer + Windows hvsocket reader:
> |---------------------------------------------------------------------------------------------|
> |Packet size ->   |      128B       |       1KB       |       4KB       |        64KB         |
> |---------------------------------------------------------------------------------------------|
> |SO_SNDBUF size | |                 Throughput in MB/s (min/max/avg/median):                  |
> |               v |                                                                           |
> |---------------------------------------------------------------------------------------------|
> |      Default    | 109/118/114/116 | 636/774/701/700 | 435/507/480/476 |   410/491/462/470   |
> |      16KB       | 110/116/112/111 | 575/705/662/671 | 749/900/854/869 |   592/824/692/676   |
> |      32KB       | 108/120/115/115 | 703/823/767/772 | 718/878/850/866 | 1593/2124/2000/2085 |
> |      64KB       | 108/119/114/114 | 592/732/683/688 | 805/934/903/911 | 1784/1943/1862/1843 |
> |---------------------------------------------------------------------------------------------|
> 
> Windows hvsocket writer + Linux hvsocket reader:
> |---------------------------------------------------------------------------------------------|
> |Packet size ->   |     128B    |      1KB        |          4KB        |        64KB         |
> |---------------------------------------------------------------------------------------------|
> |SO_RCVBUF size | |               Throughput in MB/s (min/max/avg/median):                    |
> |               v |                                                                           |
> |---------------------------------------------------------------------------------------------|
> |      Default    | 69/82/75/73 | 313/343/333/336 |   418/477/446/445   |   659/701/676/678   |
> |      16KB       | 69/83/76/77 | 350/401/375/382 |   506/548/517/516   |   602/624/615/615   |
> |      32KB       | 62/83/73/73 | 471/529/496/494 |   830/1046/935/939  | 944/1180/1070/1100  |
> |      64KB       | 64/70/68/69 | 467/533/501/497 | 1260/1590/1430/1431 | 1605/1819/1670/1660 |
> |---------------------------------------------------------------------------------------------|
> 
> Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com>

It looks like Exchange mangled you patch. It doesn't apply clean.


>