Date: Fri, 5 Oct 2018 14:00:59 -0400 From: Ryan Stone <rysto32@gmail.com> To: steevanxperia@gmail.com Cc: freebsd-hackers@freebsd.org Subject: Re: Contigfree takes too much time that cuases PCIe driver unload to take up to 30 minutes Message-ID: <CAFMmRNw7g8pPCYwJmh0yjHnm2XKRgb1d4dPDuPf6gFwnOyZxeQ@mail.gmail.com> In-Reply-To: <CAKsGTHQs49k8iRSO=pJyo-01q-CVBgAXd1pfopH52FSpNqj9oQ@mail.gmail.com> References: <CAKsGTHS_KRFBX5qzXe3QcBKavf0GNk0iyOWYjqpi_6dTE_NwCA@mail.gmail.com> <CAKsGTHQs49k8iRSO=pJyo-01q-CVBgAXd1pfopH52FSpNqj9oQ@mail.gmail.com>
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I'm not sure why configfree() would be taking a long time, but configmalloc() can be extraordinarily expensive when it needs to defragment memory to meet the request. Does your application really require a lot of physically contiguous memory? if you can restructure to not require contigmalloc() all -- maybe by using S/G DMA -- you may find your life significantly easier.
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