Friday, September 28, 2007

Novell Client for Linux

I'm running the beta of it, but keep in mind I'm also running it on openSUSE, which is not what it has been specifically designed for. That said, I do have some performance numbers. Yesterday I ran a very simple IOZONE test on a 50MB file. This isn't a great test since it fits entirely inside the server's cache. But I'm not worried about that, I just want to see how fast this code can peddle.

Performance was... not good. Unfortunately, right now I can't tell if that is a side effect of running it on openSUSE 10.2, inside a Dom0 Xen domain. I want to re-run it running the standard kernel and see if the performance also doth suck.
                                   random  random
KB reclen write rewrite read reread
51200 4 3259 3218 3875 4026
51200 8 5144 4925 5404 5215
51200 16 193 196 6980 6788
51200 32 593 599 8371 8309
51200 64 609 594 8213 8437
51200 128 589 590 8399 8432
51200 256 595 587 8551 8491
51200 512 598 595 8528 8439
51200 1024 596 588 8580 8295
51200 2048 594 596 8595 8542
51200 4096 597 609 8258 8548
51200 8192 595 599 8683 8683
51200 16384 608 599 8673 8585
As you can see, performance at record sizes over 8 is not great for writes. Reads, on the other hand, are quite zippy. Still not as zippy as the Windows client, which I've seen get up to 11000 on those tests. But still, zippy. I don't know where the problem is. I did some sniffing to try and figure it out, but nothing really stuck out as a cause. I'm seeing some 160ms delays in ACKs, but they're coming from the server. I can't tell what condition of the client-side write is causing the delayed ACK. Need more testing.

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