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[lwip-devel] [patch #7060] Patch to optionally inline ip checksum
From: |
Bill Auerbach |
Subject: |
[lwip-devel] [patch #7060] Patch to optionally inline ip checksum |
Date: |
Fri, 12 Feb 2010 15:19:44 +0000 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 (.NET CLR 3.5.30729) |
Follow-up Comment #5, patch #7060 (project lwip):
I agree, but I saw it use only one register - for the accumulating checksum.
If there is no register for this, then yes, this patch has a penalty in one
extra write per item. The extra read cancels the read that would have
resulted in the call to inet_chksum.
You could also extrapolate that if the processor can't store this checksum in
a register, it can't store the loop count in inet_chksum either and so that
routine is going to be very slow as well.
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- [lwip-devel] [patch #7060] Patch to optionally inline ip checksum, Simon Goldschmidt, 2010/02/12
- [lwip-devel] [patch #7060] Patch to optionally inline ip checksum, Bill Auerbach, 2010/02/12
- [lwip-devel] [patch #7060] Patch to optionally inline ip checksum, Simon Goldschmidt, 2010/02/12
- [lwip-devel] [patch #7060] Patch to optionally inline ip checksum,
Bill Auerbach <=
- [lwip-devel] [patch #7060] Patch to optionally inline ip checksum, Kieran Mansley, 2010/02/12
- [lwip-devel] [patch #7060] Patch to optionally inline ip checksum, Bill Auerbach, 2010/02/12
- [lwip-devel] [patch #7060] Patch to optionally inline ip checksum, Simon Goldschmidt, 2010/02/12
- [lwip-devel] [patch #7060] Patch to optionally inline ip checksum, Bill Auerbach, 2010/02/12
- [lwip-devel] [patch #7060] Patch to optionally inline ip checksum, Simon Goldschmidt, 2010/02/12
- [lwip-devel] [patch #7060] Patch to optionally inline ip checksum, Bill Auerbach, 2010/02/12