Re: [PATCH net 3/4] tcp: add tcp_tx_skb_cache sysctl

2019-06-16 Thread Feng Tang
Hi Eric, On Fri, Jun 14, 2019 at 04:22:20PM -0700, Eric Dumazet wrote: > Feng Tang reported a performance regression after introduction > of per TCP socket tx/rx caches, for TCP over loopback (netperf) > > There is high chance the regression is caused by a change on > how well the 32 KB per-threa

[PATCH net 3/4] tcp: add tcp_tx_skb_cache sysctl

2019-06-14 Thread Eric Dumazet
Feng Tang reported a performance regression after introduction of per TCP socket tx/rx caches, for TCP over loopback (netperf) There is high chance the regression is caused by a change on how well the 32 KB per-thread page (current->task_frag) can be recycled, and lack of pcp caches for order-3 pa