Messages in this thread | | | Date | Tue, 6 Jan 2009 19:37:05 +0100 | From | Jens Axboe <> | Subject | Re: Data corruption issue with splice() on 2.6.27.10 |
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On Tue, Jan 06 2009, Evgeniy Polyakov wrote: > Hi Willy. > > Unfortunately I can not work on this problem right now, but will do if > things are not resolved after Jan 11 (long vacations will be finished in > Russia and I will return to my test machines :) But right now I have > one quesstion: I read several times your mail but still can not figure > out if receiving or sending side is broken? > > I.e. can you splice from socket into the file, check the file, and then > splice to the another socket and check received data to find out which > side is broken? Or did I just missed that in the problem description? > > Thanks a lot for the test application, it will greatly help to resolve > this issue.
I'll give this a spin tomorrow as well. A hunch tells me that this is likely a page reuse issue, that splice is getting the reference to the buffer dropped before the data has really been transmitted. IOW, the page is likely fine reaching the ->sendpage() bit, but will be reused before the data has actually been transmitted. So once you get that far, other random data from that page is going out.
Just a guess, I'll try and reproduce this tomorrow!
-- Jens Axboe
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