Re: Jumbo Frames?
On 1/30/06, Andrew Sharp <andy@netfall.com> wrote:
> C -> A will end up at 1500 since C can only do 1500, obviously. B -> A,
> your switch is choking, is my *guess*.
>
> I suspect your switch it not working as well as you think it is,
> unfortunately. Is it firmware upgradeable? If so, check for updates.
> Also check the Dell forums. I have a unmanaged Dell switch, it exhibits
> the same behavior. Unfortunately, not upgradeable in my case ~:^(
I sure hope not! It's a Dell PowerEdge 5324, and it touts all sorts of goodies.
> You should get better than 50MB/s however. What are the NICs? Using a
> hacked version of netcat, to eliminate disk I/O from the picture, I see
> steady 90ish MB/s. Between two 64/66 Intel NICs across my Dell switch.
> Between any other NIC hardware combos, I see 70-80 MB/s max. Actually,
> the only other hardware I have that isn't 32bit is a Broadcom 57XX, also
> 64/66.
All the servers are identical config:
* Dual-core Opteron 175
* 2x1 gig DDR3200 ECC
* Seagate 250G SATA
* Serverworks HT1000 chipset on a Supermicro H8SSL-i motherboard
(specs: http://www.supermicro.com/Aplus/motherboard/Opteron/HT1000/H8SSL-i.cfm)
* appears to be Dual-port Broadcom BCM5704C Gigabit LAN / Ethernet Controller
Are there any sort of sysctls or echo foo >/proc/somesettings that
might help get more benefit out of jumbo frames? No magtter what I
would expect it to at least be the same speed. Not 10x worse.
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