On Tue, Nov 22, 2022 at 10:59 AM Yu Zhao <yuzhao@xxxxxxxxxx> wrote: > > On Mon, Nov 21, 2022 at 5:53 PM Ivan Babrou <ivan@xxxxxxxxxxxxxx> wrote: > > > > Hello, > > > > We have observed a negative TCP throughput behavior from the following commit: > > > > * 8e8ae645249b mm: memcontrol: hook up vmpressure to socket pressure > > > > It landed back in 2016 in v4.5, so it's not exactly a new issue. > > > > The crux of the issue is that in some cases with swap present the > > workload can be unfairly throttled in terms of TCP throughput. > > > > I am able to reproduce this issue in a VM locally on v6.1-rc6 with 8 > > GiB of RAM with zram enabled. > > Hi Ivan, > > If it's not too much trouble, could you try again with the following? > CONFIG_LRU_GEN=y > CONFIG_LRU_GEN_ENABLED=y > > I haven't tried it myself. But I'll fix whatever doesn't work for you, > since your team is on the top of my customer list :) We don't have it in production, since there we have 5.15 LTS (our kernel team is testing v6.1). I do have it enabled in my VM running v6.1-rc6 where I was able to replicate this, so it doesn't seem to help.
