Date: Sun, 28 Sep 2008 18:15:43 -0400 From: "firmdog@gmail.com" <firmdog@gmail.com> To: "Gary Palmer" <gpalmer@freebsd.org> Cc: stable@freebsd.org, net@freebsd.org Subject: Re: 7.1-PRERELEASE : bad network performance (nfe0) Message-ID: <fa1676af0809281515x64e93d8fs9b2002d83b909f7a@mail.gmail.com> In-Reply-To: <20080928205300.GF60230@in-addr.com> References: <wptzc1gu9v.fsf@heho.snv.jussieu.fr> <fa1676af0809281043k269b3d78sbf1e8006f2aa282e@mail.gmail.com> <20080928205300.GF60230@in-addr.com>
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On Sun, Sep 28, 2008 at 4:53 PM, Gary Palmer <gpalmer@freebsd.org> wrote:
> On Sun, Sep 28, 2008 at 01:43:12PM -0400, firmdog@gmail.com wrote:
> > I have the same problem on a Dell Poweredge SC440 when I transferred over
> > 50GB
> > from a FreeBSD 5.4 box to my new Dell running 7.1. Used a crossover
> cable
> > and
> > the link was 1000 full duplex, but could only get about 10M/s. Very odd.
> > Did a
> > tcpdump and saw lots of bad checksum errors.
> >
> > What other troubleshooting steps can we take? What could be the problem?
>
> Please post the first few lines of ifconfig for bge0. I'm suspecting
> you'll see something like
>
> em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>
>
> (yes, I know thats an em, not bge, but I don't have any bge's around
> here)
>
> Note that the options line say that receive and transmit checksum
> offloading is enabled. This means that for packets transmitted
> by this system, tcpdump will show checksum errors as the kernel
> is not generating the checksums, the ethernet card will. Since
> tcpdump is seeting the packet before the ethernet card does its
> magic, you get the checksum errors on transmit. Received packets
> should be fine though.
>
> Regards,
>
> Gary
>
Pasted below. When I was doing the transfer, it was 1000 full duplex and
was very slow.
This is a web/email/database server and I don't see any performance problems
yet, but
I would like to know what the problem is/was. What else can I provide?
bge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
ether 00:1a:a0:23:c0:03
inet 192.168.1.2 netmask 0xffffff00 broadcast 192.168.1.255
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
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