Date: Wed, 9 Dec 2009 11:21:00 GMT From: Alexander Motin <mav@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 171561 for review Message-ID: <200912091121.nB9BL0Rn082784@repoman.freebsd.org>
next in thread | raw e-mail | index | archive | help
http://p4web.freebsd.org/chv.cgi?CH=171561 Change 171561 by mav@mav_mavtest on 2009/12/09 11:20:05 Increase Max Read Request Size for PCIe chips to 1024 bytes. It gives those slow beasts additional 10% of write bandwidth. Affected files ... .. //depot/projects/scottl-camlock/src/sys/dev/siis/siis.c#30 edit Differences ... ==== //depot/projects/scottl-camlock/src/sys/dev/siis/siis.c#30 (text+ko) ==== @@ -231,7 +231,20 @@ siis_resume(device_t dev) { struct siis_controller *ctlr = device_get_softc(dev); + int cap; + uint16_t val; + /* Set PCIe max read request size to at least 1024 bytes */ + if (pci_find_extcap(dev, PCIY_EXPRESS, &cap) == 0) { + val = pci_read_config(dev, + cap + PCIR_EXPRESS_DEVICE_CTL, 2); + if ((val & PCIM_EXP_CTL_MAX_READ_REQUEST) < 0x3000) { + val &= ~PCIM_EXP_CTL_MAX_READ_REQUEST; + val |= 0x3000; + pci_write_config(dev, + cap + PCIR_EXPRESS_DEVICE_CTL, val, 2); + } + } /* Put controller into reset state. */ ctlr->gctl |= SIIS_GCTL_GRESET; ATA_OUTL(ctlr->r_gmem, SIIS_GCTL, ctlr->gctl);
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200912091121.nB9BL0Rn082784>