OS6 now works on x86 Legacy WARNING: NO NTGR SUPPORT!

mangrove wrote:

mangrove wrote: How do you solve the performance problem with your own encryption? Larger blocksize? Well, I guess... they did in some way. Compressed performance is ten times better than TrueCrypt, still measly but 25MB/s (write) on an iSCSI container on an encrypted volume (sequential writes). On an unencrypted volume, it is closer to 70MB/s. This looks normal in comparison to competing devices for an Atom platform.

Soooo I reverted to OS4 and did the same test. Problem is, now performance is normal again; I get 64 MB/s writing to a Truecrypt volume on an iSCSI target on a RAID5. So clearly this is related to BTRFS.

To recap: Truecrypt on OS6 on a RAID5 = 2.5-4 MB/s. Netgears own full volume encryption = 25 MB/s.

Verdict: OS6 is completely unusable with small writes to an iSCSI target on a RAID5 volume, probably due to CoW not really being disabled. I wonder if this extends to small CIFS writes as well -- or database performance.

Edit: the bulk of the problem showed to be related to the "sync writes" setting for iSCSI containers, a setting finally exposed by 6.1.9 RC5. This has made 50 MB/sec possible, still not the best performance but clearly workable.