Hello, (8-Current/i386)
I've got a problem with bus_dmamap_load_uio(9). I want to use it to map an uio for DMA with the Geode security block (glxsb(4)). It works, i can make milions of crypto operations with cryptotest. But when (i guess, i'm not sure) the free memory becomes low, bus_dmamap_load_uio() fails with errno == EFBIG. I can reproduce the problem by running "periodic daily", "dd if=/dev/zero of=foo", ... By sample i run into problems with Mem: 33M Active, 310M Inact, 82M Wired, 60M Buf, 69M Free. When it fails the uio is : uio_segflg = UIO_SYSSPACE uio_iovcnt = 1, totlen = 16384 (the total length for iov) uio_resid = 16384 (i've got some failure with size between 4000 and 16384) I don't understand why bus_dmamap_load_uio() cannot load the uio. Also when it fails, i copy the uio into a buffer and then a bus_dmamap_load() of the buffer always works. The dma tag is allocated with: bus_dma_tag_create(bus_get_dma_tag(sc->sc_dev),/* parent */ 16, 0, /* alignments, bounds */ BUS_SPACE_MAXADDR_32BIT, /* lowaddr */ BUS_SPACE_MAXADDR, /* highaddr */ NULL, NULL, /* filter, filterarg */ 16384, /* maxsize */ 1, /* nsegments */ 16384, /* maxsegsize */ BUS_DMA_ALLOCNOW, /* flags */ NULL, NULL, /* lockfunc, lockarg */ &sc->sc_dmat); The dma map is created just before the bus_dmamap_load_uio() and destroyed later. (source : http://user.lamaiziere.net/patrick/glxsb.c , see glxsb_crypto_encdec() ). I'm trying to understand and fix this problem for several days, so any idea will be very cool... thanks, regards. _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
