From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 Date: Mon, 17 Nov 2008 23:39:11 +0100 Message-ID: <4921F28F.4020300@cosmosbay.com> References: <20081117161135.GE12081@elte.hu> <49219D36.5020801@cosmosbay.com> <20081117170844.GJ12081@elte.hu> <20081117172549.GA27974@elte.hu> <4921AAD6.3010603@cosmosbay.com> <20081117182320.GA26844@elte.hu> <20081117184951.GA5585@elte.hu> <20081117220828.GB6398@elte.hu> <4921ED16.9050307@cosmosbay.com> <20081117222640.GA17880@elte.hu> Mime-Version: 1.0 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20081117222640.GA17880-X9Un+BFzKDI@public.gmane.org> Sender: kernel-testers-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="iso-8859-1"; format="flowed" To: Ingo Molnar Cc: Linus Torvalds , David Miller , rjw-KKrjLPT3xs0@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, cl-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, efault-Mmb7MZpHnFY@public.gmane.org, a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org, Stephen Hemminger Ingo Molnar a =E9crit : > * Eric Dumazet wrote: >=20 >> Ingo Molnar a =E9crit : >>> it's this division: >>> >>> if (doing_tso) { >>> [...] >>> xmit_size_goal -=3D (xmit_size_goal % mss_now); >>> >>> Has no-one hit this before? Perhaps this is why switching loopback = =20 >>> networking to TSO had a performance impact for others? >> Yes, I mentioned it later. [...] >=20 > i see - i just caught up with some of my inbox from today. >=20 >> [...] But apparently you dont read my mails, so I will just stop=20 >> now. >=20 > Sorry, i spent my time looking at the profile output. >=20 No problem Ingo, I am very glad you take so much time to profil kernel = ;) I had too many problems with profilers on my dev machine lately :(