On Sat, Feb 6, 2010 at 12:37 AM, 0bo0 <0.bugs.only.0@xxxxxxxxx> wrote: > i've a 4 drive array connected via a PCIe SATA card. > > per OS (opensuse) default, md RAID I/O performance was being limited by, > > cat /proc/sys/dev/raid/speed_limit_min > 1000 > cat /proc/sys/dev/raid/speed_limit_max > 200000 > > changing, > > echo "dev.raid.speed_limit_min=100000" >> /etc/sysctl.conf > echo "dev.raid.speed_limit_max=600000" >> /etc/sysctl.conf > > enabled full/best I/O throughput. These proc entries affect just array reconstruction, not general I/O performance/throughput, so affect just an edge-case of applications requiring maximum latency/minimum throughout guarantees. -- Daniel J Blueman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
