This blog post will compare the iozone results for OpenAFS 1.5.75 which uses the SMB to AFS gateway service and OpenAFS 1.7.23 which uses the new AFS redirector.
The test environment includes a Lenovo Thinkpad W701ds workstation running Win7-64 as the client system. 8GB ram, dual Core i7 x920 2.00GHz processors (8 cores total), Windows Experience ratings:
- Processor; 7.2
- Memory: 7.4
- Graphics: 5.8
- Gaming: 6.5
- Disk: 5.9
- BlockSize 1 (4KB)
- CacheSize 0x200000 (2GB)
- ChunkSize 21 (2MB)
- RxUdpBufSize 0xc00000
Write Performance Comparisons
One of the big complaints with the OpenAFS SMB to AFS gateway is the poor write throughput. The iozone output for 1.7.75 demonstrates the limitations. Although the peak throughput for small files (about 1MB) reaches the 30,000 KBytes/second mark, the sustained throughput for larger files is below 16,000 KBytes/second.
|OpenAFS 1.5.75 (SMB) Write Performance|
The 1.7.23 AFS Redirector does a much better job. The peak throughput increases with both the record size and the file size. Depending on the record size the throughput ranges from 30,000 KBytes/second to 65,000 KBytes/second. This is more than double the peak throughput of the SMB to AFS gateway.
|OpenAFS 1.7.23 (RDR) Write Performance|
Read Performance Comparisons1.5.75 read performance is quite inconsistent. Although there are peak throughput values above 200,000 KBytes/second the majority of record sizes are read at speeds in the 80,000 to 100,000 KBytes/second range.
|OpenAFS 1.5.75 (SMB) Read Performance|
The 1.7.23 AFS Redirector is faster by a factor of ten. The majority of record sizes demonstrate read throughput in the 800,000 KBytes/second to 1,000,000 KBytes/second range.
|OpenAFS 1.7.23 (RDR) Read Performance|