Yes. The article gives 16384 and 32768 as examples for stripe_cache_size. Such high values tend to reduce throughput instead of increasing it. Never use a value above 2048 with rust, and 1024 is usually optimal for 7.2K drives. Only go 4096 or higher with SSDs. In addition, high values eat huge amounts of memory. The formula is:
Why should the stripe-cache size differ between SSDs and rotating disks? Did you ever try to figure out yourself why it got slower with higher values? I profiled that in the past and it was a CPU/memory limitation - the md thread went to 100%, searching for stripe-heads.
So I really wonder how you got the impression that the stripe cache size should have different values for differnt kinds of drives.
Cheers, Bernd -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
