Date: Wed, 22 Feb 2023 22:31:00 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: mike tancsa <mike@sentex.net>, Alan Somers <asomers@freebsd.org> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: speeding up zfs send | recv (update) Message-ID: <78c78aec-a34b-f188-ef96-8ced9a1eda35@quip.cz> In-Reply-To: <46455168-d7f1-6ca9-ad2f-9bcd3359e0f3@sentex.net> References: <866d6937-a4e8-bec3-d61b-07df3065fca9@sentex.net> <CAOtMX2gifUmgqwSKpRGcfzCm_=BX_szNF1AF8WTMfAmbrJ5UWA@mail.gmail.com> <f6ea3387-faf8-4c63-d1e7-906fa397b00b@sentex.net> <a38578c6-b633-249d-90f0-0652377d76c0@quip.cz> <c229a502-fb76-ec6a-a56b-934d3b56e474@sentex.net> <1031e2b0-b245-1dc6-a499-8f4da3796543@quip.cz> <46455168-d7f1-6ca9-ad2f-9bcd3359e0f3@sentex.net>
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On 22/02/2023 22:08, mike tancsa wrote: > On 2/22/2023 4:03 PM, Miroslav Lachman wrote: >> Interresting numbers. I think I am the only one who get best speed >> with chacha20-poly1305@openssh.com >> >> >> It seems the speed of SSH is limited by single core performance which >> is very poor on this machine (Intel(R) Pentium(R) Dual CPU E2160). >> Even if CPU has 50% idle, ssh runs on 99.8% of single core. > > The CPU I have has > aesni0: <AES-CBC,AES-CCM,AES-GCM,AES-ICM,AES-XTS> on motherboard > > which probably helps. That explains it aesni0: No AES or SHA support. >> I know there were some HPN patches to ssh, beside that is there any >> option I can try to use less CPU? >> >> I will play with cpuset to pin ssh on one core and everything else on >> the other core. > > It looks like you are running into a CPU bottleneck TBH Yes. Pinning on cores with cpuset helps a bit (about +3MiB/s) but without some tweaks on ssh I will not gain more speed :( Thank you for your help! Miroslav Lachman
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