netdev - Re: [PATCH net-next v7 4/4] test/vsock: vsock

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Date:   Thu, 12 Jan 2023 12:53:12 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Arseniy Krasnov <AVKrasnov@...rdevices.ru>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Krasnov Arseniy <oxffffaa@...il.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>,
        kernel <kernel@...rdevices.ru>
Subject: Re: [PATCH net-next v7 4/4] test/vsock: vsock_perf utility

On Tue, 2023-01-10 at 10:18 +0000, Arseniy Krasnov wrote:
> This adds utility to check vsock rx/tx performance.
> 
> Usage as sender:
> ./vsock_perf --sender <cid> --port <port> --bytes <bytes to send>
> Usage as receiver:
> ./vsock_perf --port <port> --rcvlowat <SO_RCVLOWAT>
> 
> Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
> ---
>  tools/testing/vsock/Makefile     |   3 +-
>  tools/testing/vsock/README       |  34 +++
>  tools/testing/vsock/vsock_perf.c | 427 +++++++++++++++++++++++++++++++
>  3 files changed, 463 insertions(+), 1 deletion(-)
>  create mode 100644 tools/testing/vsock/vsock_perf.c
> 
> diff --git a/tools/testing/vsock/Makefile b/tools/testing/vsock/Makefile
> index f8293c6910c9..43a254f0e14d 100644
> --- a/tools/testing/vsock/Makefile
> +++ b/tools/testing/vsock/Makefile
> @@ -1,8 +1,9 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> -all: test
> +all: test vsock_perf
>  test: vsock_test vsock_diag_test
>  vsock_test: vsock_test.o timeout.o control.o util.o
>  vsock_diag_test: vsock_diag_test.o timeout.o control.o util.o
> +vsock_perf: vsock_perf.o
>  
>  CFLAGS += -g -O2 -Werror -Wall -I. -I../../include -I../../../usr/include -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -D_GNU_SOURCE
>  .PHONY: all test clean
> diff --git a/tools/testing/vsock/README b/tools/testing/vsock/README
> index 4d5045e7d2c3..84ee217ba8ee 100644
> --- a/tools/testing/vsock/README
> +++ b/tools/testing/vsock/README
> @@ -35,3 +35,37 @@ Invoke test binaries in both directions as follows:
>                         --control-port=$GUEST_IP \
>                         --control-port=1234 \
>                         --peer-cid=3
> +
> +vsock_perf utility
> +-------------------
> +'vsock_perf' is a simple tool to measure vsock performance. It works in
> +sender/receiver modes: sender connect to peer at the specified port and
> +starts data transmission to the receiver. After data processing is done,
> +it prints several metrics(see below).
> +
> +Usage:
> +# run as sender
> +# connect to CID 2, port 1234, send 1G of data, tx buf size is 1M
> +./vsock_perf --sender 2 --port 1234 --bytes 1G --buf-size 1M
> +
> +Output:
> +tx performance: A Gbits/s
> +
> +Output explanation:
> +A is calculated as "number of bits to send" / "time in tx loop"
> +
> +# run as receiver
> +# listen port 1234, rx buf size is 1M, socket buf size is 1G, SO_RCVLOWAT is 64K
> +./vsock_perf --port 1234 --buf-size 1M --vsk-size 1G --rcvlowat 64K
> +
> +Output:
> +rx performance: A Gbits/s
> +total in 'read()': B sec
> +POLLIN wakeups: C
> +average in 'read()': D ns
> +
> +Output explanation:
> +A is calculated as "number of received bits" / "time in rx loop".
> +B is time, spent in 'read()' system call(excluding 'poll()')
> +C is number of 'poll()' wake ups with POLLIN bit set.
> +D is B / C, e.g. average amount of time, spent in single 'read()'.
> diff --git a/tools/testing/vsock/vsock_perf.c b/tools/testing/vsock/vsock_perf.c
> new file mode 100644
> index 000000000000..a72520338f84
> --- /dev/null
> +++ b/tools/testing/vsock/vsock_perf.c
> @@ -0,0 +1,427 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * vsock_perf - benchmark utility for vsock.
> + *
> + * Copyright (C) 2022 SberDevices.
> + *
> + * Author: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
> + */
> +#include <getopt.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <stdbool.h>
> +#include <string.h>
> +#include <errno.h>
> +#include <unistd.h>
> +#include <time.h>
> +#include <stdint.h>
> +#include <poll.h>
> +#include <sys/socket.h>
> +#include <linux/vm_sockets.h>
> +
> +#define DEFAULT_BUF_SIZE_BYTES	(128 * 1024)
> +#define DEFAULT_TO_SEND_BYTES	(64 * 1024)
> +#define DEFAULT_VSOCK_BUF_BYTES (256 * 1024)
> +#define DEFAULT_RCVLOWAT_BYTES	1
> +#define DEFAULT_PORT		1234
> +
> +#define BYTES_PER_GB		(1024 * 1024 * 1024ULL)
> +#define NSEC_PER_SEC		(1000000000ULL)
> +
> +static unsigned int port = DEFAULT_PORT;
> +static unsigned long buf_size_bytes = DEFAULT_BUF_SIZE_BYTES;
> +static unsigned long vsock_buf_bytes = DEFAULT_VSOCK_BUF_BYTES;
> +
> +static void error(const char *s)
> +{
> +	perror(s);
> +	exit(EXIT_FAILURE);
> +}

For the records, I suggested to use the existing error() libcall, see
man 3 error.

Not a big deal. This can be merged as-is, and you can follow-up, it you
find it useful.

Cheers,

Paolo