nV News Forums - View Single Post - Lower than expected performance, FreeBSD 6 + PCI Express GeForce 6200 + nvidia 7676

**zander** · 12-02-05, 09:23 AM

@Aphax: the problem you're seeing isn't caused by insufficient bus bandwidth, the PCI Express link speed is the same on FreeBSD as it is on Linux. The problem is that the NVIDIA FreeBSD graphics driver can't currently allocate write-combined memory (a FreeBSD kernel limitation that's being worked on), which some of the fallback paths in NVIDIA's libGL do not currently handle very well. We hope to address this in a future driver release. Meanwhile, native PCI-E GPUs should perform well on FreeBSD.

@ayleron: some of the problems you're seeing are caused by the same problem that Aphax is experiencing. AGP cards should be unaffected, though.

12-02-05, 09:23 AM	#5
zander NVIDIA Corporation Join Date: Aug 2002 Posts: 3,740	Re: Lower than expected performance, FreeBSD 6 + PCI Express GeForce 6200 + nvidia 7676 @Aphax: the problem you're seeing isn't caused by insufficient bus bandwidth, the PCI Express link speed is the same on FreeBSD as it is on Linux. The problem is that the NVIDIA FreeBSD graphics driver can't currently allocate write-combined memory (a FreeBSD kernel limitation that's being worked on), which some of the fallback paths in NVIDIA's libGL do not currently handle very well. We hope to address this in a future driver release. Meanwhile, native PCI-E GPUs should perform well on FreeBSD. @ayleron: some of the problems you're seeing are caused by the same problem that Aphax is experiencing. AGP cards should be unaffected, though.