From mboxrd@z Thu Jan 1 00:00:00 1970 From: rick.jones2@hp.com (Rick Jones) Date: Wed, 15 Apr 2015 11:19:15 -0700 Subject: [Xen-devel] "tcp: refine TSO autosizing" causes performance regression on Xen In-Reply-To: <1429121303.7346.126.camel@edumazet-glaptop2.roam.corp.google.com> References: <1428596218.25985.263.camel@edumazet-glaptop2.roam.corp.google.com> <1428932970.3834.4.camel@edumazet-glaptop2.roam.corp.google.com> <1429115934.7346.107.camel@edumazet-glaptop2.roam.corp.google.com> <552E9E8D.1080000@eu.citrix.com> <1429118948.7346.114.camel@edumazet-glaptop2.roam.corp.google.com> <552EA2BC.5000707@eu.citrix.com> <1429120373.7346.125.camel@edumazet-glaptop2.roam.corp.google.com> <552EA604.8010400@hp.com> <1429121303.7346.126.camel@edumazet-glaptop2.roam.corp.google.com> Message-ID: <552EABA3.30109@hp.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 04/15/2015 11:08 AM, Eric Dumazet wrote: > On Wed, 2015-04-15 at 10:55 -0700, Rick Jones wrote: >>> >>> Have you tested this patch on a NIC without GSO/TSO ? >>> >>> This would allow more than 500 packets for a single flow. >>> >>> Hello bufferbloat. >> >> Woudln't the fq_codel qdisc on that interface address that problem? > > Last time I checked, default qdisc was pfifo_fast. Bummer. > These guys do not want to change a sysctl, how pfifo_fast will magically > becomes fq_codel ? Well, I'm not sure that it is George and Jonathan themselves who don't want to change a sysctl, but the customers who would have to tweak that in their VMs? rick