On Wed, Apr 24 2013, peter chang wrote: > when using the sg backend we crash w/ a SEGV in fio_sgio_getevents() > because of memory corruption from the IO. when we allocate the td's > backing store there's a possible post-allocation adjustment to page > align the buffers. however, the extra memory that this alignment may > need is not taken into account when allocating the buffer. > > Tested: > - the problematic fio file looks like > fdha347:~# cat foo.fio > [global] > bs=64k > thread > rw=read > size=100g > time_based=1 > runtime=60 > iodepth=1 > > [sdc] > ioengine=sg > filename=/dev/sg2 > numjobs=1 Thanks, good description and the potential extra alignment bytes isn't an issue. Applied! -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
