Abysmal re(4) performance under 8.1-STABLE (mid-August)

[Marek 'Buki' Kozlovský]

On Sun, Nov 07, 2010 at 12:24:21PM +0100, Ulrich Spörlein wrote:
> On Sat, 06.11.2010 at 23:19:33 -0700, Pyun YongHyeon wrote:
> > On Sat, Nov 6, 2010 at 2:37 AM, Ulrich Spörlein <uqs at spoerlein.net> wrote:
> > > Hello Pyun,
> > >
> > > On this new server, I cannot get more than ~280kByte/s up/downstream out of
> > > re(4) without any tweaking.
> > >
> > > re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> > >        options=389b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_UCAST,WOL_MCAST,WOL_MAGIC>
> > >        ether 00:21:85:63:74:34
> > >        inet6 fe80::221:85ff:fe63:7434%re0 prefixlen 64 scopeid 0x1
> > >        inet 46.4.12.147 netmask 0xffffffc0 broadcast 46.4.12.191
> > >        nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
> > >        media: Ethernet autoselect (100baseTX <half-duplex>)
> > >        status: active
> > >
> > 
> > It seems the link was resolved to half-duplex. Does link partner
> > also agree on the resolved speed/duplex?
> 
> As this is a dedicated server in a colo hundreds of km away, I have no
> means to check this easily. Especially I cannot change the setting from
> auto-neg. Btw, linux will show a negotiated 100/full link via mii-tool.

you can always ask the guys responsible for network infrastructure

> > > # ifconfig re0
> > > re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> > >        options=88<VLAN_MTU,VLAN_HWCSUM>
> > >        ether 00:21:85:63:74:34
> > >        inet6 fe80::221:85ff:fe63:7434%re0 prefixlen 64 scopeid 0x1
> > >        inet 46.4.12.147 netmask 0xffffffc0 broadcast 46.4.12.191
> > >        nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
> > >        media: Ethernet 100baseTX <full-duplex> (100baseTX <half-duplex>)
> > >        status: active
> > >
> > 
> > This time, it seems  you used forced media configuration
> > instead of auto. It still shows duplex mismatch so it's
> > normal to see poor performance. What makes me wonder
> > is why you have duplex mismatch?
> > Did you use forced media configuration on link partner?
> > What happens when you use different switch?
> 
> Sadly, none of these options are available to me :/
> But even 100/half should give more than enough performance, right?

no, not if the other end is 100/full. Duplex mismatch usually gives around
100-200 kB/s. I've experienced this (around 75kB/s), setting speed/duplex
manually fixed the problem.

> Uli
> _______________________________________________
> freebsd-stable at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
> To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"

Buki
-- 
PGP public key: http://dev.null.cz/buki.asc

                /"\
                \ /     ASCII Ribbon Campaign
                 X      Against HTML & Outlook Mail
                / \     http://www.thebackrow.net

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20101107/8ef38491/attachment.pgp