Commit e8b3b5e9 authored Oct 25, 2008 by Tejun Heo Committed by Jeff Garzik Oct 27, 2008

sata_sil24: configure max read request size to 4k



Due to request posting limitations, bandwidth of sil3132 is limited to
around 120MB/s with the minimum pci-e payload size (128bytes) which is
used by most consumer systems.  However, write throughput can be
slightly (~3%) increased by increasing the max read requeset size.
Configure it to 4k which is the maximum supported.  This optimization
is also done by SIMG's windows driver.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

parent 3cd8ddbd

drivers/ata/sata_sil24.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -1329,6 +1329,11 @@ static int sil24_init_one(struct pci_dev pdev, const struct pci_device_id ent)
		}
		}

		/* Set max read request size to 4096. This slightly increases
		* write throughput for pci-e variants.
		*/
		pcie_set_readrq(pdev, 4096);

		sil24_init_controller(host);

		pci_set_master(pdev);