Re: selective block polling and preadv2/pwritev2 revisited

From
Sagi Grimberg <hidden>
Date
2016-01-07 14:41:38
Also in
linux-fsdevel
Reply to
Martin K. Petersen, 2016-01-06
Hi Martin,
Sagi> This means that the user would need to pass iovec entries of 8
Sagi> bytes correct? Seems like a waste for large IOs (sorry for
Sagi> diverging from the subject)

The assumption was that there would be a 1:1 mapping between the number
of data buffers and the metadata ditto. But nothing says that a data
iovec entry is limited in size to a single sector.
Yea... I meant 1:1, I got confused on the 8 bytes comment...
The other option to have a single iovec at the end representing the
metadata for all data buffers. I think there are valid use cases for
either approach and we may end up having to support both via a flag.
Either approach presents limitation, but I guess user-space can deal
with it...
Thread (2 messages) 2 messages, 2 authors, 2016-01-07
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