>>> The article is found at >>> https://pushbx.org/ecm/dokuwiki >>> /doku.php?id=blog:pushbx:2023:0321_cpu_performance_comparison >> >> I mostly agree with you and your article, but: > > fine that you agree, but at most 50% of the article is even close to > 'right'.
You're the one who said, "I mostly agree with you and your article, but:", not me. >>> Conclusion >>> >>> CPU-bound benchmarks are much faster on a modern machine than they >>> are on older ones. >>> The frequency increase does not actually suffice to explain the >>> speedup. >>> Some things, like doing I/O, were not sped up nearly as much >>> however. > I tried posting a much longer response to this, but it was > apparently rejected by the moderators. Here's a shorter one. >> I/O has also vastly speedup (we have SSD speeds of up to 6 GB/sec). >> Just not by doing IN/OUT, but by using memory mapped PCI devices. >> I think you're confusing two different things -- MMIO and DMA/Bus- >> Mastering. > He is NOT. I wasn't talking about ecm being confused, I was talking about you. AFAIK, ecm never tested either MMIO or bus-mastering so never said anything about them. >> Whether I/O is PMIO or MMIO is pretty much irrelevant to the speed. >> For example, I/O port 201h (the analog joystick) and I/O port 92h >> (which controls A20 on some computers) are both VERY slow and would >> not be any faster if they were MMIO instead of PMIO. > this is plain bullshit. Care to explain in more detail? >> The speed depends on the I/O device, not the type of I/O mapping. > which is nonsense. Care to explain in more detail? >> Plus, I/O _can't_ be cached, whether PMIO or MMIO, so the cache(s) >> are irrelevant to I/O. > yes. I/O device data can't be cached. you are such a clever person to > discover this fact. WOW. Glad you agree that I/O can't be cached. >> SSD speeds are fast because they use bus-mastering, not because >> they use MMIO. The I/O ports are used to "control" the device, but >> the data from the SSD is transferred in and out of RAM using >> bus-mastering (which is fast because it doesn't use the CPU at all). > I understand that you don't have the faintest clue how modern PCI > devices work. Just go ahead with undertaining us ... Please enlighten me. _______________________________________________ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
