![]() ![]() Because typical I/O operations don’t consume much bandwidth, how quickly a system can respond to multiple storage access requests is typically more important than the amount of bandwidth they can dedicate to any single task. There is a close relationship between bandwidth and latency. Latency, on the other hand, is the measure of how long it takes for the data to reach its destination. ![]() Throughput is the average amount of data that actually passes through over a given period of time. As we have already discussed, bandwidth refers to the network’s capacity and the amount of data that can be transmitted during a specific period of time. Bandwidth is the maximum amount of data that can pass through the network at any given time. Latency measures the speed of packet transfers whereas bandwidth is used to refer to the maximum capacity of the network. Latency, bandwidth, and throughput are all interrelated, but they all measure different things. If there are 10,000 I/O requests backed up, the end-user is going to notice the lag. Network latency, throughput, and bandwidth. A hard drive with infinite bandwidth and a seek time of 10ms can respond to a maximum of 100 data accesses per second, whether those requests are for 1MB or 1TB. As Harris points out, however, bandwidth doesn’t measure how long it takes the computer to service a request. While both may impact the users perception of speed, they tell us different things about the. Latency determines whether there’ll be interruptions or not. While he doesn’t discuss legacy computing, his answer explains why even old machines benefit so much from a storage upgrade.ĭisk manufacturers like to quote bandwidth because it’s easy to measure and understand. Bandwidth mainly measures how much data can be delivered to your home. ![]() Over at ZDNet, Robin Harris discusses why latency is so much more important than bandwidth in SSD performance. While a single CPU core won’t push a modern SATA SSD very hard either, the relationship between CPU and HDD performance is quite different than the relationship between CPU and GPU performance. If your CPU wasn’t fast enough to drive the entire card - and this was the case for some lower-end chips - you could get arguably “free” antialiasing relative to the maximum performance your system was capable of. One niche use case for the old 3dfx Voowas to pair it with a weaker CPU and devote the second GPU core to anti-aliasing. ![]()
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