Tejun Heo wrote:
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@xxxxxxxxxx>
---
drivers/ata/sata_sil24.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 4621807..ccee930 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -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);
applied
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