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List: e1000-devel
Subject: Re: [E1000-devel] Question on net_stats->rx_dropped setting to "0"
From: Jesse Brandeburg <jesse.brandeburg () gmail ! com>
Date: 2011-05-30 4:12:19
Message-ID: BANLkTimw1AfZDEfndAgxB6xO56ZtK+V_zw () mail ! gmail ! com
[Download RAW message or body]
You have to overrun the fifo on the hardware to see rx_dropped error
from hardware. Currently your cpu is fast enough to keep up with the
packet load.
On Wed, May 25, 2011 at 7:32 PM, Filo FeFi <j1132s@yahoo.com> wrote:
> Ah!
>
> I've been looking for it in kernel version 2.6.18 which doesn't seem
> to have the function. I should have mentioned it.
>
> In my test, I'm send many packets to the ixgbe:
> kernel 2.6.18
> ixgbe 3.3.9 w/o NAPI
>
> I'm seeing ixgbe's call to netif_rx() returning NET_RX_DROP, and it is
> incrementing adapter->rx_dropped_backlog. However, this value isn't
> reported by ifconfig's rx dropped.
>
> I can see ixgbe_ethtool.c sends it to ethtool, so I can use that; also,
> as per Eric Dumazet's earlier email, I see that /proc/net/softnet_stat
> drop count being incremented in the netif_rx() function.
>
> But so far, I keep seeing "0" in ifconfig's RX dropped. I'm wondering
> under what situation can I see something other than "0".
>
> Thanks,
> Ching
>
>
> --- On Wed, 5/25/11, Alexander Duyck <alexander.h.duyck@intel.com> wrote:
>
> > From: Alexander Duyck <alexander.h.duyck@intel.com>
> > Subject: Re: [E1000-devel] Question on net_stats->rx_dropped setting to "0"
> > To: "Filo FeFi" <j1132s@yahoo.com>
> > Cc: "e1000-devel@lists.sourceforge.net" <e1000-devel@lists.sourceforge.net>, \
> > "Skidmore, Donald C" <donald.c.skidmore@intel.com>
> > Date: Wednesday, May 25, 2011, 11:57 AM
> > The function should be around line
> > 1500 in /net/core/dev.c of the Linux
> > kernel. I've included a link to it in lxr below.
> >
> > http://lxr.linux.no/#linux+v2.6.39/net/core/dev.c#L1498
> >
> > Thanks,
> >
> > Alex
> >
> > On 05/25/2011 02:41 PM, Filo FeFi wrote:
> > > Hi Don,
> > >
> > > Could you please elaborate a little on the
> > dev_forward_skb() ?
> > > Where can I find that function?
> > >
> > > I was about to conclude that ixgbe always report "0"
> > for RX drop,
> > > but I would like to know the correct answer.
> > >
> > > Thanks,
> > > Ching
> > >
> > > --- On Mon, 5/23/11, Skidmore, Donald C<donald.c.skidmore@intel.com>
> > wrote:
> > >
> > > > From: Skidmore, Donald C<donald.c.skidmore@intel.com>
> > > > Subject: RE: [E1000-devel] Question on
> > net_stats->rx_dropped setting to "0"
> > > > To: "Filo FeFi"<j1132s@yahoo.com>,
> > "e1000-devel@lists.sourceforge.net"<e1000-devel@lists.sourceforge.net>
> > > > Date: Monday, May 23, 2011, 5:55 PM
> > > > Hi Ching,
> > > >
> > > > As you noted we (ixgbe) doesn't modify this value,
> > other
> > > > than initialing it to zero. However
> > elsewhere in the
> > > > stack it is modified. One example being
> > dev_forward_skb().
> > > > So ixgbe devices may report rx_dropped as
> > something other
> > > > than "0".
> > > >
> > > > Thanks,
> > > > -Don
> > > >
> > > > > -----Original Message-----
> > > > > From: Filo FeFi [mailto:j1132s@yahoo.com]
> > > > > Sent: Thursday, May 19, 2011 7:19 PM
> > > > > To: e1000-devel@lists.sourceforge.net
> > > > > Subject: [E1000-devel] Question on
> > > > net_stats->rx_dropped setting to "0"
> > > > > Dear ixgbe developers:
> > > > >
> > > > > I'm debugging a problem where some frames get
> > dropped
> > > > by the ixgbe
> > > > > driver (version 2.0.44-k2), i.e. /proc/net/dev
> > "drop"
> > > > is not 0.
> > > > > Reading the ixgbe-3.3.9/2.0.44.13/2.0.44.14
> > source, I
> > > > see the line
> > > > > (in ixgbe_main.c ixgbe_update_stats()):
> > > > "net_stats->rx_dropped = 0;"
> > > > > So, does this mean that ixgbe always reports
> > "0" for RX
> > > > dropped?
> > > > > Under what circumstances would /proc/net/dev's
> > drop
> > > > count for ixgbe
> > > > > be incremented/changed from "0"?
> > > > >
> > > > > Thank you,
> > > > > Ching Tai
> > > > > (650) 506-1454
> > > > >
> > > > >
> > > > >
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