On Fri, 18 Jan 2013, Piergiorgio Sartor wrote: > I tried the patch below with kernel 3.7, I updated > my local git copy to that version. > > I'm sorry to say it does not seem to fix the issue. > > Some explanation, I made three trials, with reboot > inbetween, of course. > The first one got the error -110 almost immediately, > the second did not show any problem, even with some > load of the CPU, the third did show the error, but > after some time, specifically after I loaded the > I/O sub system with a kernel recompilation. > Note that, during the compilation (make -j5) the transfer > rate of the USB HDDs went up and down, with about a > decrease of 10% from the usual one (from 4100 KB/sec to > 3700 KB/sec) as minimum. This I did not notice before, > but maybe I just did not notice... > > I also tried to run twice the USB HDDs reading, in > this case, while the problem did not show up, I could > see that the transfer rate did not change, maybe the > multiple queue operation did have some positive effects. > > Nevertheless, bottom line is that I got the problem two > out of three times, so it seems to me the fix was not > completely effective. > > I've some log, but there's a lot of garbage in it, I > esitate to post here or on the bugzilla page, if you > want I can dig something or I can retry in order to > get a cleaner one. Don't worry about the log. Well, I guess there's no choice but to go back to the one-at-a-time approach. I'll write a proper patch for that. 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
