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Sun, 17 Mar 2024 13:26:56 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCWjbbYTHG4dx5PcXAmJleAIN8iSb/4KjxQRTfG+uTJv+j0AIMMjsU7W6vdBLvAhcUOP0UThBSSYQsqGaIb53/eXv0lR7SEjOnO24QGEZpU/Fp8yfofN4/l4g0/OBBdgYz7EnGs81A== X-Gm-Message-State: AOJu0YyiL1oK+DLPHttQzSlc2/OjL60JcmTJ7DgtpG1PW9pz8IUyrdj4 AvEFD01plECyopYydsHqMOgrN2Gqf/C39kyS2kGN9orCB3Vl5c2olSgyW/2VFaVtRA04gSFVYjb Q31Hxt4tb/Ze4MpBBzYiAIIikzxo= X-Google-Smtp-Source: AGHT+IEtX/2rdlpZWIoXhO+/1pZQdn8NmpRcKUr96gOK7m0cHIpoSefVFaZQEkipTopBUadlIQgU6pgoBYBkckIfT/Q= X-Received: by 2002:a05:622a:254:b0:430:cf6d:9bd with SMTP id c20-20020a05622a025400b00430cf6d09bdmr2439046qtx.34.1710707216560; Sun, 17 Mar 2024 13:26:56 -0700 (PDT) List-Id: Networking and TCP/IP with FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-net List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-net@freebsd.org MIME-Version: 1.0 References: <42C327BD-6CE4-43AA-A1AE-3BEC08D623DB@freebsd.org> <486915F0-456B-4B09-A8BC-93BBA79C4CA1@freebsd.org> <20240313080624.6c73908c@ernst.home> <508E3B47-8E1B-469F-97B1-2171A3098888@freebsd.org> <86a5n1i0xg.fsf@ltc.des.dev> <78D1FF09-71A3-4486-B934-D8332F54B237@freebsd.org> <20240316104053.20bef8c2@ernst.home> <20240316115128.33d11f7b@ernst.home> <7367F29A-D52B-4828-B79A-AA2667E81E7D@freebsd.org> <4FF534F6-B35D-4596-8D1E-226AD1347AC8@freebsd.org> <6e795e9c-8de4-4e02-9a96-8fabfaa4e66f@app.fastmail.com> In-Reply-To: <6e795e9c-8de4-4e02-9a96-8fabfaa4e66f@app.fastmail.com> From: Nuno Teixeira Date: Sun, 17 Mar 2024 20:26:45 +0000 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: Request for Testing: TCP RACK To: Drew Gallatin Cc: tuexen@freebsd.org, garyj@gmx.de, current@freebsd.org, net@freebsd.org, Randall Stewart Content-Type: text/plain; charset="UTF-8" Hello, > I don't have the full context, but it seems like the complaint is a performance regression in bonnie++ and perhaps other things when tcp_hpts is loaded, even when it is not used. Is that correct? > > If so, I suspect its because we drive the tcp_hpts_softclock() routine from userret(), in order to avoid tons of timer interrupts and context switches. To test this theory, you could apply a patch like: It's affecting overall system performance, bonnie was just a way to get some numbers to compare. Tomorrow I will test patch. Thanks! -- Nuno Teixeira FreeBSD Committer (ports)