Date: Thu, 15 Aug 2019 17:38:22 +0300 From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: freebsd-net@freebsd.org Subject: Re: igb netstat input counters 2x? Message-ID: <52b37710-8eb3-7e08-ee04-4682deb93c76@yandex.ru> In-Reply-To: <20190814002705.GD2342@funkthat.com> References: <20190814002705.GD2342@funkthat.com>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --QC5I8Les35Q23YMu4bkOKleND2YL3RHJI Content-Type: multipart/mixed; boundary="SpA76jSROhuoysCdPdJ6UIS4n3RDA61UP"; protected-headers="v1" From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: freebsd-net@freebsd.org Message-ID: <52b37710-8eb3-7e08-ee04-4682deb93c76@yandex.ru> Subject: Re: igb netstat input counters 2x? References: <20190814002705.GD2342@funkthat.com> In-Reply-To: <20190814002705.GD2342@funkthat.com> --SpA76jSROhuoysCdPdJ6UIS4n3RDA61UP Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 14.08.2019 03:27, John-Mark Gurney wrote: > I'm doing some perf testing on an APU4 board, and I noticed that > it looks like the input netstat counters are 2x than what they should > be. >=20 > I was seeing 60MiB/sec via netstat -w 1 -I igb1: > 40034 0 0 60760352 2538 0 177909 0 > 40700 0 0 61776228 2574 0 180300 0 >=20 > But the program was only reading 27MB/sec. I decided to read the mac > stats directly via: > bytes=3D$(sysctl -n dev.igb.1.mac_stats.good_octets_recvd); while sleep= 1; do > nbytes=3D$(sysctl -n dev.igb.1.mac_stats.good_octets_recvd) > echo $(($nbytes - $bytes)); bytes=3D$nbytes > done >=20 > and saw much more reasonable numbers: > 31099740 > 30512488 > 30675974 >=20 > Which is more in line w/ the 27MB/sec that the program reports. >=20 > I haven't looked at the code to see what could be causing the double > counting. Also, the output numbers appear to be accurate. >=20 > This is with 13.0-CURRENT from the July 25th snapshot, which is r350322= =2E Does this doubling happens only with IBYTES counter? What about IPACKETS? Also I'd check L2/L3 addresses to be sure that they by accident are not broadcast/multicast. --=20 WBR, Andrey V. Elsukov --SpA76jSROhuoysCdPdJ6UIS4n3RDA61UP-- --QC5I8Les35Q23YMu4bkOKleND2YL3RHJI Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/ iQEzBAEBCAAdFiEE5lkeG0HaFRbwybwAAcXqBBDIoXoFAl1VbmQACgkQAcXqBBDI oXoIKggAnaVq0IpdhJ8Bv+91G2zd0Rm6/RTxyD6zofM+TPhLSgVZ1Wxk/ygcm6fa lPi4GnXvrwhz2996ZUurbUC72gp6yJ0Trb25iGHYfwySCUhgmk6O3yRKmvq79Lu/ m4i8YYp4os59ccTPurEVGUWjYCn3AWz5tpq6hHnc/7FjokFvSEI6yaFPjOoVYJhP /nn3D9QD9S2orRZx6Xeajwukq0LnUhmHnwNq+pvJwrW9aqjyL+OTs8XDdl9mcTEL 0AsT1oTei4lYA3ypMLcj5aKltdvxc6f5OWHgbBxLFlNET2E5fEK6rUGDoWdJcRxi WKw5pA3Os2We/eJoV0Gi0Bf42GIBkA== =aE5G -----END PGP SIGNATURE----- --QC5I8Les35Q23YMu4bkOKleND2YL3RHJI--
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