> Is there a sysctl parameter that will limit the amount of memory > the kernel uses for systems buffers used for file systems and direct > I/O to a block device? (While waiting for expert advice...) I think you can lower /proc/sys/vm/pagecache and swappiness. But I heard pagecache may not work in newer kernels. The real problem is, applications make memory dirty, unnecessarily. Let's say I copy a big file, or gzip it. Lots of memory pages will become dirty and they'll be written to disk. If the application (cp, gzip, or your Storix) can open files with O_DIRECT option, then the filesystem page cache won't be used. Otherwise, we could use a filesystem that allows direct I/O mount option. I know ext2 or ext3 doesn't support it. (Linus doesn't like the idea.) Yong Huang -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
