did you knoll? does istl start out with knoll as well?I'm afraid I don't know what knoll is, so I wouldn't know.
sorry for being cryptic, figured you'd run into it by now :)http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPSetInitialGuessKnoll.html - it's one way of obtaining an initial guess that is nonzero.
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