On Wed, 17 Feb 2010, Ramya Desai wrote: > > I don't know anything about the internals of hdparm, and you can read > > the man page as well as I can. > > When I looked into the man page it says ?write-sector to write zeros > into the specified sector. The same man page says that NOT to use > this option. That is the reason I am asking here. > > > What version of Linux are you using? > I am using the 2.6.32 and 2.6.32-rc6 which are checked out from Sarah Sharp git > > >And which scheduler? > CFQ. > > >Some people have found that the default scheduler (CFQ) leads to worse I/O > > performance than other schedulers. See > > https://lists.one-eyed-alien.net/pipermail/usb-storage/2010-January/004970.html > > This link says low performance occurs for copyng of multiple files. > But I am always testing with single large ZIP / TAR files. Still low > performance The people who wrote those email messages don't know every detail about how the kernel works; you shouldn't believe everything they say. You should try using a different scheduler. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
