Re: sw-iommu leak with Ethernet jumbo frames and nfs

From: Francois Romieu
Date: Sun Oct 19 2008 - 13:06:21 EST

Joe Harvell <jharvell+lists.linux-kernel@xxxxxxxxxx> :
> I noticed a problem with SW-IOMMU allocation failures when using NFS over
> my PCI Ethernet network interface using jumbo frames. I think it's a leak,
> rather than under-engineered because the problem only happens when using
> NFS and jumbo frames. When I run netperf at a much higher data rate over
> the NIC, I don't see any problems. Also, I think it's a leak because the
> problem still occurrs very quickly even when I double the SW-IOMMU heap
> The Ethernet controller is an on-board Realtek R8110SC using driver r8169.

This was fixed before 2.6.27 as commit a866bbf6aacf95f849810079442a20be118ce905.

Thanks for the detailled bug report.

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