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Date: Fri, 16 Feb 2018 20:54:47 +0100 From: Oleksandr Natalenko <oleksandr@...alenko.name> To: Holger Hoffstätte <holger@...lied-asynchrony.com> Cc: Neal Cardwell <ncardwell@...gle.com>, Eric Dumazet <eric.dumazet@...il.com>, "David S. Miller" <davem@...emloft.net>, Netdev <netdev@...r.kernel.org>, Yuchung Cheng <ycheng@...gle.com>, Soheil Hassas Yeganeh <soheil@...gle.com>, Jerry Chu <hkchu@...gle.com>, Eric Dumazet <edumazet@...gle.com>, Dave Taht <dave.taht@...il.com> Subject: Re: TCP and BBR: reproducibly low cwnd and bandwidth Hi. On pátek 16. února 2018 18:56:12 CET Holger Hoffstätte wrote: > There is simply no reason why you shouldn't get approx. line rate > (~920+-ish) Mbit over wired 1GBit Ethernet; even my broken 10-year old > Core2Duo laptop can do that. Can you boot with spectre_v2=off and try "the > simplest case" with the defaults cubic/pfifo_fast? spectre_v2 has terrible > performance impact esp. on small/older processors. Just have tried. No visible difference. > When I last benchmarked full PREEMPT with 4.9.x it was similarly bad and > also had a noticeable network throughput impact even on my i7. > > Also congratulations for being the only other person I know who ever tried > YeAH. :-) Well, according to the git log on tcp_yeah.c and Reported-by tag, I was not the only one there ;). Regards, Oleksandr
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