Hi Jens, here are again the two pending patches you asked me to resend [1]. One of them, fixing read-starvation problems, was accompanied by a cover letter. I'm pasting the content of that cover letter below.
The patch addresses (serious) starvation problems caused by request-tag exhaustion, as explained in more detail in the commit message. I started from the solution in the function kyber_limit_depth, but then I had to define more articulate limits, to counter starvation also in cases not covered in kyber_limit_depth. If this solution proves to be effective, I'm willing to port it somehow to the other schedulers. Thanks, Paolo [1] https://www.spinics.net/lists/linux-block/msg21586.html Paolo Valente (2): block, bfq: limit tags for writes and async I/O block, bfq: limit sectors served with interactive weight raising block/bfq-iosched.c | 158 +++++++++++++++++++++++++++++++++++++++++++++++++--- block/bfq-iosched.h | 17 ++++++ block/bfq-wf2q.c | 3 + 3 files changed, 169 insertions(+), 9 deletions(-) -- 2.15.1
