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Commit e8b3b5e9f54512bfdb7c154da07ec0408cbd6c56

Authored by Tejun Heo
Committed by Jeff Garzik
1 parent 3cd8ddbd86
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

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>

Showing 1 changed file with 5 additions and 0 deletions Side-by-side Diff

drivers/ata/sata_sil24.c
Diff comments   View file @ e8b3b5e
... ... @@ -1329,6 +1329,11 @@
1329 1329 }
1330 1330 }
1331 1331  
  1332 + /* Set max read request size to 4096. This slightly increases
  1333 + * write throughput for pci-e variants.
  1334 + */
  1335 + pcie_set_readrq(pdev, 4096);
  1336 +
1332 1337 sil24_init_controller(host);
1333 1338  
1334 1339 pci_set_master(pdev);