Date: Thu, 16 Nov 2023 14:05:10 +0100 From: "Herbert J. Skuhra" <herbert@gojira.at> To: tuexen@freebsd.org Cc: current@freebsd.org, net@freebsd.org Subject: Re: Request for Testing: TCP RACK Message-ID: <87o7ftyhkp.wl-herbert@gojira.at> In-Reply-To: <87pm09ykb8.wl-herbert@gojira.at> References: <42C327BD-6CE4-43AA-A1AE-3BEC08D623DB@freebsd.org> <87pm09ykb8.wl-herbert@gojira.at>
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On Thu, 16 Nov 2023 13:06:03 +0100, "Herbert J. Skuhra" wrote: > > Hi, > > On Thu, 16 Nov 2023 10:13:05 +0100, tuexen@freebsd.org wrote: > > > > Dear all, > > > > recently the main branch was changed to build the TCP RACK stack > > which is a loadable kernel module, by default: > > https://cgit.FreeBSD.org/src/commit/?id=3a338c534154164504005beb00a3c6feb03756cc > > > > As discussed on the bi-weekly transport call, it would be great if people > > could test the RACK stack for their workload. Please report any problems to the > > net@ mailing list or open an issue in the bug tracker and drop me a note via email. > > This includes regressions in CPU usage, regressions in performance or any other > > unexpected change you observe. > > > > You can load the kernel module using > > kldload tcp_rack > > > > You can make the RACK stack the default stack using > > sysctl net.inet.tcp.functions_default=rack > > > > Based on the feedback we get, the default stack might be switched to the > > RACK stack. > > > > Please let me know if you have any questions. > > I am running main-n266450-a592812327de with a GENERIC-NODEBUG kernel. > > # kldload tcp_rack > kldload: an error occurred while loading module tcp_rack. Please check > dmesg(8) for more details. > > In dmesg: > KLD tcp_rack.ko: depends on tcphpts - not available or version mismatch > linker_load_file: /boot/kernel/tcp_rack.ko - unsupported file type > > So you have to build a kernel with "options TCPHPTS" first? OK, I am now running GENERIC-NODEBUG + "options TCPHPTS". After setting "sysctl net.inet.tcp.functions_default=rack" git no longer works: # sysctl net.inet.tcp.functions_default=rack $ git pull client_loop: send disconnect: Broken pipe fatal: the remote end hung up upon initial contact # sysctl net.inet.tcp.functions_default=freebsd $ git pull Already up to date. -- Herbert
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