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LAN & WAN Reviews

The Test and Verdict

Since the GS108 is an unmanaged switch, there's not much more to say about it, so I'll cut right to the testing.

I tested using two systems running WinXP SP2 - one an Athlon 64 3000+ w/ 512 MB, the other a 2.4GHz Pentium 4 w/ 504MB. I ran the IxChariot high performance_throughput script with no changes using TCP/IP. This script sends 10,000,000 Bytes between test endpoints and instructs endpoints running on Windows NT, 2000, and XP to use overlapped I/O to achieve the highest possible throughput.

Each machine had an Intel Pro 1000/MT desktop adapter with 8.5.14.0 (3/8/2005) driver. The adapters were both set to "Auto Detect" mode and reported connecting at 1000Mbps Full Duplex. The adapters allow setting jumbo frame sizes of 4088, 9014 and 16128 Bytes. But since the GS108 jumbo frame feature supports only up to 9K frame sizes, I limited my testing to the 4088 and 9014 settings.

GS108 xmit throughput comparison

Figure 2: GS108 xmit throughput comparison
(click on the image for a larger view)

Figures 2 and 3 show results similar to those I found when testing the RX3141's jumbo frame feature. For my setup, best results were achieved using the 4088 Byte (4K) setting. I got a 22% improvement in average transmit throughput and just shy of 30% for receive.

GS108 rcv throughput comparison
Figure 3: GS108 rcv throughput comparison
(click on the image for a larger view)

You can see that while using 9K (9014) jumbo frames provided a net increase in average throughput over the 30 second test, throughput was highly variable. This fallback in throughput with larger jumbo frame size is not due to anything in the GS108, but to hardware and software limitations in the two computers used for the test.

So contrary to what a few networking product manufacturers have told me, jumbo frames can improve performance for non-enterprise networking users and - at least the way the GS108 implements it - the feature is a no-brainer to use.The tricky part for consumers, at least during the period while retail inventories are changing over, will be figuring out whether you're buying a GS108 that supports jumbo frames.

NETGEAR doesn't plan to change the GS108's model number and told me purchasers will be able to identify the jumbo frame version by the specifications printed on the box. Another method will be via serial number, after NETGEAR publishes information that describes which serial numbers are which. Unfortunately, both methods require physical inspection of the product, which doesn't work for corporate or e-tail buyers. NETGEAR also said that while they expect to roll the jumbo frame change into production during August, it could be late September before product hits shelves.

So kudos for NETGEAR for leading the way on jumbo frames for the masses, and doing it with no price increase! But I hope they relent and make it possible for buyers to know that they're getting jumbo frame-capable product without actually having product in-hand.

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