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Wi-Fi Router Charts

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Mesh System Charts

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Write Performance - more

Figures 8, 9 and 10 show the write results with a 1 Gbps Ethernet connection and no, 4k and 9k jumbo frames. Given that the caching effects dominate the plots, the difference in gigabit-connected performance isn't obvious. The best way to see the difference is to open the large versions of the three plots in three browser tabs and click between them.


 Figure 8: ReadyNAS NV Write performance - 1 Gbps

Figure 8: ReadyNAS NV Write performance - 1 Gbps
(click image to enlarge)

The change between the no jumbo (Figure 8) and 4k Jumbo (Figure 9) is the easiest to see with the blue area (> 300,000 kBytes/sec) at the top of the plots expanding noticeably. You can also see the light yellow 256 kByte record size ridge area (100,000 to 150,000 kBytes/sec) area expand upward.


Figure 9: ReadyNAS NV Write performance - 1 Gbps, 4k jumbo frames

Figure 9: ReadyNAS NV Write performance - 1 Gbps, 4k jumbo frames
(click image to enlarge)

There are smaller changes in those same areas between using 4k (Figure 9) and 9k (Figure 10) jumbo frames. But you can also see a slight rise in the light blue plateau at the right front of the Figure 10. This area is beyond the cached effect area, so indicates that bumping up to the larger jumbo frame size helped in this case.

Taking full advantage of jumbo frames requires enough CPU oomph on both ends of the connection, plus good network adapter design, and is highly dependent on the system that is doing the reading and writing. In this case, at least, the computer and network adapter on the iozone machine look like they are up to the task.


Figure 10: ReadyNAS NV Write performance - 1 Gbps, 9k jumbo frames

Figure 10: ReadyNAS NV Write performance - 1 Gbps, 9k jumbo frames
(click image to enlarge)

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