TCP/UDP cksum offload on hme(4)
yongari at kt-is.co.kr
Wed Jun 16 03:59:44 GMT 2004
On Wed, Jun 16, 2004 at 12:45:20PM +0900, To freebsd-sparc64 at freebsd.org wrote:
> Hello All,
> I made a patch that enables cksum offloads on hme(4). Originally
> the patch was made for OpenBSD due to FreeBSD's lack of FAS366
> support. Now, we had esp(4) ported by Scott, I could port the patch
> from my OpenBSD patch. During simple test phase, I didn't notice
> 1. UDP TX cksum offload has an issue. The hardware doesn't flip the
> cksum bits when the computed cksum is 0x0000. I have no idea this
> is the reason why STP2002QFP says it supports only TCP RX/TX cksum.
> (pp. 29, pp. 40, pp. 42)
> 2. The patch was tested on Ultra2(2x300MHz, FAS366). I'd like to
> hear ok/nok results from PCI based sparc64 users.
> The dmesg of the Ultra2 is available at:
> 3. I couldn't feel performance boost from the cksum offloads but
> enabling it reduced system loads considerably.
> The attached patch is for -CURRENT(2004.06.07), and is also available at:
The corrected URL is:
Pyun YongHyeon <http://www.kr.freebsd.org/~yongari>
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