I just upgraded my machine to CUDA 2.2 and Fedora 10 (it had been on CUDA 2.0 and Fedora 8). All of a sudden, the host-device bandwidth reported by the SDK has roughly halved. This is a completely fresh install of both Fedora 10 (although I allowed it up update itself), and then CUDA 2.2:
[font=“Courier New”]$ uname -rsv
Linux 2.6.27.24-170.2.68.fc10.x86_64 #1 SMP Wed May 20 22:47:23 EDT 2009
$ cat /proc/driver/nvidia/version
NVRM version: NVIDIA UNIX x86_64 Kernel Module 185.18.08 Thu Apr 30 15:48:49 PDT 2009
GCC version: gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC)
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The bandwidthTest is now reporting about 3 GB/sec to pinned memory, when it had been more like 6 before (under Fedora 8 and CUDA 2.0). Is this a known issue?