On 02/07/19 20:01:13, Ming Lei wrote: > On Tue, Jul 02, 2019 at 12:46:45PM +0200, Andrea Vai wrote: > > Hi, > > I have a problem writing data to a USB pendrive, and it seems > > kernel-related. With the help of Greg an Alan (thanks) and some > > bisect, I found out the offending commit being > > > > commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6 > > > > [...] > > > > One possible reason may be related with too small 'nr_requests', could > you apply the following command and see if any difference can be made? > > echo 32 > /sys/block/sdN/queue/nr_requests I applied it (echo 32 > /sys/block/sdf/queue/nr_requests), ran the test again, and still failed. I assumed I didn't have to build the kernel again, did I? (sorry but I am not skilled) Many thanks, Andrea