Poorer networking performance in later kernels?

2016-04-15 Thread Butler, Peter
(Please keep me CC'd to all comments/responses) I've tried a kernel upgrade from 3.4.2 to 4.4.0 and see a marked drop in networking performance. Nothing was changed on the test systems, other than the kernel itself (and kernel modules). The identical .config used to build the 3.4.2 kernel was

Re: Poorer networking performance in later kernels?

2016-04-15 Thread Eric Dumazet
On Fri, 2016-04-15 at 21:02 +, Butler, Peter wrote: > (Please keep me CC'd to all comments/responses) > > I've tried a kernel upgrade from 3.4.2 to 4.4.0 and see a marked drop in > networking performance. Nothing was changed on the test systems, other than > the kernel itself (and kernel mo

Re: Poorer networking performance in later kernels?

2016-04-15 Thread Rick Jones
On 04/15/2016 02:02 PM, Butler, Peter wrote: (Please keep me CC'd to all comments/responses) I've tried a kernel upgrade from 3.4.2 to 4.4.0 and see a marked drop in networking performance. Nothing was changed on the test systems, other than the kernel itself (and kernel modules). The identica

RE: Poorer networking performance in later kernels?

2016-04-18 Thread Butler, Peter
.4.0 kernels perform identically - just as you would expect. Any other ideas? What can I be missing here? Peter -Original Message- From: Rick Jones [mailto:rick.jon...@hpe.com] Sent: April-15-16 6:37 PM To: Butler, Peter ; netdev@vger.kernel.org Subject: Re: Poorer networking perf

Re: Poorer networking performance in later kernels?

2016-04-18 Thread Eric Dumazet
On Fri, 2016-04-15 at 15:33 -0700, Eric Dumazet wrote: > On Fri, 2016-04-15 at 21:02 +, Butler, Peter wrote: > > (Please keep me CC'd to all comments/responses) > > > > I've tried a kernel upgrade from 3.4.2 to 4.4.0 and see a marked drop in > > networking performance. Nothing was changed on

RE: Poorer networking performance in later kernels?

2016-04-18 Thread Butler, Peter
form the tests in this setup the 3.4.2 and 4.4.0 kernels perform identically - just as you would expect. Any other ideas? What can I be missing here? Peter -Original Message- From: Rick Jones [mailto:rick.jon...@hpe.com] Sent: April-15-16 6:37 PM To: Butler, Peter ; netdev@vger.kerne

RE: Poorer networking performance in later kernels?

2016-04-18 Thread Butler, Peter
pril-18-16 8:17 AM To: Butler, Peter Cc: netdev@vger.kernel.org Subject: Re: Poorer networking performance in later kernels? On Fri, 2016-04-15 at 15:33 -0700, Eric Dumazet wrote: > On Fri, 2016-04-15 at 21:02 +, Butler, Peter wrote: > > (Please keep me CC'd to all comments/resp

RE: Poorer networking performance in later kernels?

2016-04-18 Thread Butler, Peter
mailto:eric.duma...@gmail.com] Sent: April-18-16 8:17 AM To: Butler, Peter Cc: netdev@vger.kernel.org Subject: Re: Poorer networking performance in later kernels? On Fri, 2016-04-15 at 15:33 -0700, Eric Dumazet wrote: > On Fri, 2016-04-15 at 21:02 +, Butler, Peter wrote: > > (Please

Re: Poorer networking performance in later kernels?

2016-04-18 Thread Eric Dumazet
On Mon, 2016-04-18 at 16:27 +, Butler, Peter wrote: > Hi Eric > > Thanks for your response. My apologies for being late in getting back > to you - I wasn't able to have access to the lab hardware on the > weekend. > > I performed your test as suggested - I've provided a side-by-side diff > o

Re: Poorer networking performance in later kernels?

2016-04-18 Thread Rick Jones
people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? :) Any other ideas? What can I be missing here? Peter -Original Message- From: Rick Jones [mailto:rick.jon...@hpe.com] Sent: April-15-16 6:3

RE: Poorer networking performance in later kernels?

2016-04-19 Thread Butler, Peter
> -Original Message- > From: Rick Jones [mailto:rick.jon...@hpe.com] > Sent: April-15-16 6:37 PM > To: Butler, Peter ; netdev@vger.kernel.org > Subject: Re: Poorer networking performance in later kernels? > > On 04/15/2016 02:02 PM, Butler, Peter wrote: >>

Re: Poorer networking performance in later kernels?

2016-04-19 Thread Josh Hunt
On Tue, Apr 19, 2016 at 9:54 AM, Butler, Peter wrote: >> -Original Message- >> From: Rick Jones [mailto:rick.jon...@hpe.com] >> Sent: April-15-16 6:37 PM >> To: Butler, Peter ; netdev@vger.kernel.org >> Subject: Re: Poorer networking performance in later kern

Re: Poorer networking performance in later kernels?

2016-04-19 Thread Oliver Hartkopp
On 04/19/2016 04:54 PM, Butler, Peter wrote: I think the issue is resolved. I had to recompile my 4.4.0 kernel with a few options pertaining to the Intel NIC which somehow (?) got left out or otherwise clobbered when I ported my 3.4.2 .config to the 4.4.0 kernel source tree. With those cha

RE: Poorer networking performance in later kernels?

2016-04-19 Thread Butler, Peter
> I think the issue is resolved. I had to recompile my 4.4.0 kernel with a few > options pertaining to the Intel NIC which somehow (?) got left out or > otherwise clobbered when I ported my 3.4.2 .config to the 4.4.0 kernel source > tree. With those changes now in I see essentially identical p

Re: Poorer networking performance in later kernels?

2016-04-19 Thread David Miller
From: Oliver Hartkopp Date: Tue, 19 Apr 2016 17:58:03 +0200 > On 04/19/2016 04:54 PM, Butler, Peter wrote: > >> >> I think the issue is resolved. I had to recompile my 4.4.0 kernel >> with a few options pertaining to the Intel NIC which somehow (?) got >> left out or otherwise clobbered when I

RE: Poorer networking performance in later kernels?

2016-04-19 Thread Butler, Peter
On Tue, Apr 19, 2016 at 9:54 AM, Butler, Peter wrote: >> -Original Message- >> From: Rick Jones [mailto:rick.jon...@hpe.com] >> Sent: April-15-16 6:37 PM >> To: Butler, Peter ; netdev@vger.kernel.org >> Subject: Re: Poorer networking performance in later kern