We have a 2TB HDD which we formated using default options of mkfs.ext4(v1.42.6). I took around ~15 seconds to complete this operation. Than we formatted the same partition with "-G 1024" and there was around 30% performance improvement in the mkfs.ext4 timings. Than, out of curiosity, we increased the G's value to 1048576 and there was a drastic degradation in the performance of mkfs.ext4. It took more than 5 minutes to complete the execution. Is it the expected behavior? AFAIK flex_bg is on by default with G's vaule as 16. Can we consider this the optimum value? Any suggesstions on what we can set the Gs value for a 2TB HDD such that both the FS and the mkfs.ext4 gives optimum performance? It would be really helpful if somebody can shed some light over this feature. Thanks, Ashish -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
