Date: Thu, 30 Nov 2006 19:25:04 -0500 (EST) From: Charles Sprickman <spork@bway.net> To: Mark Kirkwood <markir@paradise.net.nz> Cc: Philipp Ost <pj@smo.de>, freebsd-stable@freebsd.org Subject: Re: vr speed issues Message-ID: <Pine.OSX.4.61.0611301856420.415@gee5.nat.fasttrackmonkey.com> In-Reply-To: <456F5952.9020305@paradise.net.nz> References: <Pine.OSX.4.61.0611282212530.517@white.nat.fasttrackmonkey.com> <456DA282.6000801@smo.de> <20061129183028.L23451@sporker.bway.net> <456E6C55.3070609@paradise.net.nz> <456F5952.9020305@paradise.net.nz>
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On Fri, 1 Dec 2006, Mark Kirkwood wrote:
> Mark Kirkwood wrote:
>> Charles Sprickman wrote:
>>
>>> I also did a little more digging and noticed that once I start pinging
>>> from one of these hosts using large packet sizes, I get about 50-60%
>>> packet loss (ie: ping -s 1500 other.vr0.host). If I ping something with a
>>> decent card, I get about 30-50% packet loss. There's no packet loss with
>>> the default packet size.
>>>
>>> Anyone else with some vr cards feel like checking this out?
>>>
>>
>> I've got a VIA Rhine III card that I can dig out and put in if the data
>> would be of any use/interest etc - FWIW I seem to recall being able to get
>> reasonably close to wire speed when I was using it.
>>
>
> I plugged in the card today, and seem to get pretty reasonable performance
> (8-10MB/s for scp - see attached). The two boxes are plugged into a Linksys
> router via store made cat5 or cat6 cables. The second box has an Intel PRO
> 100 (fxp) adapter.
Interesting. I've had the vr hosts going through three different
switches, patch cables, the in-house cabling, and the issue remains the
same. I'd love to just replace a cable and be done with it, but that
doesn't seem to be the issue. I can also eliminate it by just switching
out cards... so I don't really suspect I've got a whole load of bad
cables.
> Removing the vr card and going back to fxp everywhere seems to provide better
> performance (e.g. get 9MB/s in the last test), but the vr performance is
> acceptable (maybe your router clashes with your card?).
Mine borders on unusable. The packet loss really slows down and stalls
TCP connections.
I noticed you have a newer revision of the Via card:
# pciconf -lv
vr0@pci0:9:0: class=0x020000 card=0x14031186 chip=0x31061106 rev=0x86
hdr=0x00
vendor = 'VIA Technologies Inc'
device = 'VT6105M/LOM Rhine III PCI Fast Ethernet Controller'
class = network
subclass = ethernet
This is what I'm dealing with:
hostb6@pci0:17:7: class=0x060000 card=0x287e1106 chip=0x287e1106
rev=0x00 hdr=0x00
vendor = 'VIA Technologies Inc'
class = bridge
subclass = HOST-PCI
vr0@pci0:18:0: class=0x020000 card=0x80a71043 chip=0x30651106 rev=0x7c
hdr=0x00 vendor = 'VIA Technologies Inc'
device = 'VT6102 Rhine II PCI Fast Ethernet Controller'
class = network
subclass = ethernet
Maybe I'll just round up as much info as I can at my next visit, grab some
tcpdumps of the loss from both ends and do a send-pr and hope for the
best. I can get along with replacing the cards, but they seem to be
really common these days - basically any cheap system with a Via chipset
and onboard ethernet will be using some variation on this controller.
Charles
>
> Cheers
>
> Mark
>
>
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