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Fri, 22 Aug 2025 23:55:34 +0000 Message-ID: Date: Fri, 22 Aug 2025 16:55:32 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH iwl-next v2] igb: Convert Tx timestamping to PTP aux worker To: Sebastian Andrzej Siewior , Kurt Kanzenbach CC: Tony Nguyen , Przemek Kitszel , Andrew Lunn , "David S. Miller" , Eric Dumazet , "Jakub Kicinski" , Paolo Abeni , Richard Cochran , Vinicius Costa Gomes , Paul Menzel , Vadim Fedorenko , Miroslav Lichvar , , References: <20250822-igb_irq_ts-v2-1-1ac37078a7a4@linutronix.de> <20250822075200.L8_GUnk_@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: <20250822075200.L8_GUnk_@linutronix.de> Content-Type: multipart/signed; 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boundary="------------D2p0b1uEAXrUvgKeJudH4buT"; protected-headers="v1" From: Jacob Keller To: Sebastian Andrzej Siewior , Kurt Kanzenbach Cc: Tony Nguyen , Przemek Kitszel , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Richard Cochran , Vinicius Costa Gomes , Paul Menzel , Vadim Fedorenko , Miroslav Lichvar , 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> In-Reply-To: <20250822075200.L8_GUnk_@linutronix.de> --------------D2p0b1uEAXrUvgKeJudH4buT Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 8/22/2025 12:52 AM, Sebastian Andrzej Siewior wrote: > On 2025-08-22 09:28:10 [+0200], Kurt Kanzenbach wrote: >> The current implementation uses schedule_work() which is executed by t= he >> system work queue to retrieve Tx timestamps. This increases latency an= d can >> lead to timeouts in case of heavy system load. >> >> Therefore, switch to the PTP aux worker which can be prioritized and p= inned >> according to use case. Tested on Intel i210. >> >> Signed-off-by: Kurt Kanzenbach >> --- >> Changes in v2: >> - Switch from IRQ to PTP aux worker due to NTP performance regression = (Miroslav) >> - Link to v1: https://lore.kernel.org/r/20250815-igb_irq_ts-v1-1-8c6fc= 0353422@linutronix.de >=20 > For the i210 it makes sense to read it directly from IRQ avoiding the > context switch and the delay resulting for it. For the e1000_82576 it > makes sense to avoid the system workqueue and use a dedicated thread > which is not CPU bound and could prioritized/ isolated further if > needed. > I don't understand *why* reading the TS in IRQ is causing this packet > loss. This is also what the igc does and the performance improved > afa141583d827 ("igc: Retrieve TX timestamp during interrupt handling")= >=20 > and here it causes the opposite? >=20 > Sebastian Miroslav reported a test using ntpperf which showed a pretty significant impact for higher rates. It was indeed better for low rates, but was much worse for high rates. See the following: https://lore.kernel.org/all/aKMbekefL4mJ23kW@localhost/ In all cases the use of the thread was better, so this improves the behavior without regressing in the case of many more packets. It is unclear exactly why the ntpperf test fails so badly in that case with the higher rate for i210. --------------D2p0b1uEAXrUvgKeJudH4buT-- --------------Z6zl6BvFenBzGNQxov8UN6ee 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+bw8o6AUCaKkDdAUDAAAAAAAKCRBqll0+bw8o6FGS AQCQDaRZXUpV3ve4eqWLRRwT0H+fdst7ueIoPESIPColHQD8CwLV+1wYAztTWfdOo6VxXRThzcyA AL6245UYZbDyJwk= =U+tI -----END PGP SIGNATURE----- --------------Z6zl6BvFenBzGNQxov8UN6ee--