Hi, During a btrfs balance, the process hogs all CPU. Or, to be exact, any other program that wishes to use the SSD during a btrfs balance is blocked for long periods. Long periods being more than 5 seconds. Is there any way to multiplex SSD access while btrfs balance is operating, so that other applications can still access the SSD with relatively low latency?
My guess is that btrfs is doing a transaction with a large number of SSD blocks at a time, and thus blocking other applications. This makes for atrocious user interactivity as well as applications failing because they cannot access the disk in a relatively low latent manner. For, example, this is causing a High Definition network CCTV application to fail. What I would really like, is for some way to limit SSD bandwidths to applications. For example the CCTV app always gets the bandwidth it needs, and all other applications can still access the SSD, but are rate limited. This would fix my particular problem. We have rate limiting for network applications, why not disk access also? Kind Regards James -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
