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Wed, 27 Aug 2025 16:21:23 +0000 Message-ID: Date: Wed, 27 Aug 2025 09:21:20 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH iwl-next v2] igb: Convert Tx timestamping to PTP aux worker To: Sebastian Andrzej Siewior , Miroslav Lichvar CC: Kurt Kanzenbach , Tony Nguyen , Przemek Kitszel , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , "Paolo Abeni" , Richard Cochran , Vinicius Costa Gomes , Paul Menzel , Vadim Fedorenko , , References: <20250822-igb_irq_ts-v2-1-1ac37078a7a4@linutronix.de> <20250822075200.L8_GUnk_@linutronix.de> <87ldna7axr.fsf@jax.kurt.home> <02d40de4-5447-45bf-b839-f22a8f062388@intel.com> <20250826125912.q0OhVCZJ@linutronix.de> <20250827141047.H_n5FMzY@linutronix.de> <20250827145235.6ph_Wzn8@linutronix.de> Content-Language: en-US From: Jacob Keller Autocrypt: addr=jacob.e.keller@intel.com; keydata= xjMEaFx9ShYJKwYBBAHaRw8BAQdAE+TQsi9s60VNWijGeBIKU6hsXLwMt/JY9ni1wnsVd7nN J0phY29iIEtlbGxlciA8amFjb2IuZS5rZWxsZXJAaW50ZWwuY29tPsKTBBMWCgA7FiEEIEBU qdczkFYq7EMeapZdPm8PKOgFAmhcfUoCGwMFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4AA CgkQapZdPm8PKOiZAAEA4UV0uM2PhFAw+tlK81gP+fgRqBVYlhmMyroXadv0lH4BAIf4jLxI UPEL4+zzp4ekaw8IyFz+mRMUBaS2l+cpoBUBzjgEaFx9ShIKKwYBBAGXVQEFAQEHQF386lYe MPZBiQHGXwjbBWS5OMBems5rgajcBMKc4W4aAwEIB8J4BBgWCgAgFiEEIEBUqdczkFYq7EMe apZdPm8PKOgFAmhcfUoCGwwACgkQapZdPm8PKOjbUQD+MsPBANqBUiNt+7w0dC73R6UcQzbg cFx4Yvms6cJjeD4BAKf193xbq7W3T7r9BdfTw6HRFYDiHXgkyoc/2Q4/T+8H In-Reply-To: <20250827145235.6ph_Wzn8@linutronix.de> Content-Type: multipart/signed; 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boundary="------------DqXB7vjU2giz6ZxZ5pcUPt0T"; protected-headers="v1" From: Jacob Keller To: Sebastian Andrzej Siewior , Miroslav Lichvar Cc: Kurt Kanzenbach , Tony Nguyen , Przemek Kitszel , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Richard Cochran , Vinicius Costa Gomes , Paul Menzel , Vadim Fedorenko , intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org Message-ID: Subject: Re: [PATCH iwl-next v2] igb: Convert Tx timestamping to PTP aux worker References: <20250822-igb_irq_ts-v2-1-1ac37078a7a4@linutronix.de> <20250822075200.L8_GUnk_@linutronix.de> <87ldna7axr.fsf@jax.kurt.home> <02d40de4-5447-45bf-b839-f22a8f062388@intel.com> <20250826125912.q0OhVCZJ@linutronix.de> <20250827141047.H_n5FMzY@linutronix.de> <20250827145235.6ph_Wzn8@linutronix.de> In-Reply-To: <20250827145235.6ph_Wzn8@linutronix.de> --------------DqXB7vjU2giz6ZxZ5pcUPt0T Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 8/27/2025 7:52 AM, Sebastian Andrzej Siewior wrote: > On 2025-08-27 16:41:09 [+0200], Miroslav Lichvar wrote: >> From the results I posted before, the machine (CPU Intel E3-1220) with= >> the I350 NIC can provide about 59k HW TX timestamps per second without= >> any of the patches, about 41k with the original patch, and about 52k >> with this patch and pinned aux worker. >=20 > I might have similar hardware with a i350 to give it a try. > The old worker approach and the pinned AUX worker are identical from > software design (or: I am not aware of any significant differences wort= h > to mention here). Therefore I don't understand why the one had 59k and > the other 52k. >=20 > Sebastian Right. If we can get further reproduction of this setup that would be goo= d. Thanks, Jake --------------DqXB7vjU2giz6ZxZ5pcUPt0T-- --------------cW3FJZ2GMUthglS4100DoB7G Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- wnsEABYIACMWIQQgQFSp1zOQVirsQx5qll0+bw8o6AUCaK8wgQUDAAAAAAAKCRBqll0+bw8o6Dvj AP904WkfIPjhL02PiQh/rYcBCksmtQVDSwY0PGYGjsvi9AD6AvOSD1thtkpSfb0g1I8vg8g7sv9b YsZmxVQOIFzX8wE= =npQO -----END PGP SIGNATURE----- --------------cW3FJZ2GMUthglS4100DoB7G--