David> I wish you had started the thread by mentioning this
David> specific patch, we wasted an enormous amount of precious
David> developer time speculating and asking for arbitrary tests
David> to be run in order to narrow down the problem, yet you knew
David> the specific cha
From: Roland Dreier <[EMAIL PROTECTED]>
Date: Tue, 07 Mar 2006 17:17:30 -0800
> The reason TSO comes up is that reverting the patch described below
> helps (or helped at some point at least) IPoIB throughput quite a bit.
I wish you had started the thread by mentioning this specific
patch, we wast
David> How limited are the IPoIB devices, TX descriptor wise?
David> One side effect of the TSO changes is that one extra
David> descriptor will be used for outgoing packets. This is
David> because we have to put the headers as well as the user
David> data, into page based buf
From: Matt Leininger <[EMAIL PROTECTED]>
Date: Tue, 07 Mar 2006 16:11:37 -0800
> I used the standard setting for tcp_rmem and tcp_wmem. Here are a
> few other runs that change those variables. I was able to improve
> performance by ~30MB/s to 403 MB/s, but this is still a ways from the
> 474
On Tue, 2006-03-07 at 13:49 -0800, Stephen Hemminger wrote:
> On Tue, 07 Mar 2006 13:44:51 -0800
> Matt Leininger <[EMAIL PROTECTED]> wrote:
>
> > On Mon, 2006-03-06 at 19:13 -0800, Shirley Ma wrote:
> > >
> > > > More likely you are getting hit by the fact that TSO prevents the
> > > congestion
Quoting r. Stephen Hemminger <[EMAIL PROTECTED]>:
> Is IB using NAPI or just doing netif_rx()?
No, IPoIB doesn't use NAPI.
--
Michael S. Tsirkin
Staff Engineer, Mellanox Technologies
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On Tue, 07 Mar 2006 13:44:51 -0800
Matt Leininger <[EMAIL PROTECTED]> wrote:
> On Mon, 2006-03-06 at 19:13 -0800, Shirley Ma wrote:
> >
> > > More likely you are getting hit by the fact that TSO prevents the
> > congestion
> > window from increasing properly. This was fixed in 2.6.15 (around mid
On Mon, 2006-03-06 at 19:13 -0800, Shirley Ma wrote:
>
> > More likely you are getting hit by the fact that TSO prevents the
> congestion
> window from increasing properly. This was fixed in 2.6.15 (around mid
> of Nov 2005).
>
> Yep, I noticed the same problem. After updating to the new kernel,
