On Sun, Dec 26, 2010 at 03:38:51PM -0800, Mark Knecht wrote: > First, the drives are 4K sector so it's really important to get them > on the right partition boundary. Installing Gentoo requires that we > un-tar some large-ish files. IIRC on a 512 byte boundary these drives > took 20-30 minutes to do this. On a 4K boundary they took about 1 > minute. I know that doesn't make sense but those were my numbers, and > it's a very high end Intel i7-980x MB so there wasn't any other > problem I could find. Mark, Thanks for your contribution. You're seeing a 20-30 fold performance issue, where only about 2x would be expected. So to test this theory I'll see if we can evacuate a partition, untar a large-ish file as a benchmark, and then see if we can improve that by changing the alignment of the partition. (hmm. Maybe we should do things the other way around. First find a tar-workload that takes about 1 minute on a properly working drive, and then we can wait up to 30 minutes for it to finish on the improper setup.). Being able to reproduce a problem at will is a great progress to being able to solve it! Roger. -- ** R.E.Wolff@xxxxxxxxxxxx ** http://www.BitWizard.nl/ ** +31-15-2600998 ** ** Delftechpark 26 2628 XH Delft, The Netherlands. KVK: 27239233 ** *-- BitWizard writes Linux device drivers for any device you may have! --* Q: It doesn't work. A: Look buddy, doesn't work is an ambiguous statement. Does it sit on the couch all day? Is it unemployed? Please be specific! Define 'it' and what it isn't doing. --------- Adapted from lxrbot FAQ -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
