john t wrote:
Hi Shannon,
The bandwidth figures that you quoted below match with my
readings for single port Mellanox DDR HCA (both for unidirection and
bidirection). So it seems dual port SDR HCA performs as good as single
port DDR HCA. It would help if you can also tell the bandwidth
Off-line someone asked me to clarify my earlier e-mail. Given this
discussion continues, perhaps this might help explain the performance a
bit more. The Max Payload Size quoted here is what is typically
implemented on x86 chipsets though other chipsets may use a larger
value. From a pure band
Hi Shannon,
The bandwidth figures that you quoted below match with my readings for single port Mellanox DDR HCA (both for unidirection and bidirection). So it seems dual port SDR HCA performs as good as single port DDR HCA. It would help if you can also tell the bandwidth that you got using one p
At 07:18 AM 10/5/2006, Roland Dreier wrote:
> Bernard> I don't think it is the PCI-e bus because it can handle
> Bernard> much more than 20 Gb/s.
>
>This isn't true. Mellanox cards have PCI-e x8 interfaces, which has a
>theoretical limit of 16 Gb/sec in each direction, and a practical
>lim
John,
In our testing with dual port Mellanox SDR HCAs, we found that not all
PCI-express implementations are equal. Depending on the PCIe chipset,
we measured unidirectional SDR dual-rail bandwidth ranging from
1100-1500 MB/sec and bidirectional SDR dual-rail bandwidth ranging from
1570-2600
Roland Dreier <[EMAIL PROTECTED]> wrote on 10/05/2006
10:18:49 AM:
> Bernard> I don't think it is the PCI-e bus because
it can handle
> Bernard> much more than 20 Gb/s.
>
> This isn't true. Mellanox cards have PCI-e x8 interfaces, which
has a
> theoretical limit of 16 Gb/sec in each dir
Bernard> I don't think it is the PCI-e bus because it can handle
Bernard> much more than 20 Gb/s.
This isn't true. Mellanox cards have PCI-e x8 interfaces, which has a
theoretical limit of 16 Gb/sec in each direction, and a practical
limit that is even lower due to packetization and other
"john t" <[EMAIL PROTECTED]>
wrote on 10/05/2006 08:18:31 AM:
> Hi Bernard,
>
> I had a configuration issue. I fixed it and now
I get same BW (i.e.
> around 10 Gb/sec) on each port provided I use ports on different HCA
> cards. If I use two ports of the same HCA card then BW gets divided
> be
Hi Bernard,
I had a configuration issue. I fixed it and now I get same BW (i.e. around 10 Gb/sec) on each port provided I use ports on different HCA cards. If I use two ports of the same HCA card then BW gets divided between these two ports. I am using Mellanox HCA cards and doing simple send/rec
John,
Who's adapter (manufacturer) are you
using? It is usually an adapter implementation or driver issue that occures
when you cannot scale across multiple links. The fact that you don't scale
up from one link, but it appears they share a fixed bandwidth across N
links means that there is a driv
Hi,
I have two HCA cards, each having two ports and each connected to a separate PCI-E x8 slot.
Using one HCA port I get end to end BW of 11.6 Gb/sec (uni-direction RDMA).
If I use two ports of the same HCA or different HCA, I get between 5 to 6.5 Gb/sec point-to-point BW on each port. BW on ea
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