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Increase PCIe maximuim read request size to 2048. Because re(4) uses

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Tx DMA burst size 2048, I beleive PCIe maximum read request size
also should match to the value of Tx DMA burst size. With this
change I can get more than 800Mbps for TCP bulk transfers.
Previously I was not able to get more than 700Mbps. If I enable TSO
it now shows 927Mbps.
This commit is contained in:
yongari 2010-02-21 00:00:55 +00:00
parent 413b4ea947
commit f7a42cd9ea
1 changed files with 3 additions and 0 deletions
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3
sys/dev/re/if_re.c
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@ -1162,6 +1162,9 @@ re_attach(device_t dev)
msic = 0;
if (pci_find_extcap(dev, PCIY_EXPRESS, &reg) == 0) {
sc->rl_flags |= RL_FLAG_PCIE;
/* Set PCIe maximum read request size to 2048. */
if (pci_get_max_read_req(dev) < 2048)
pci_set_max_read_req(dev, 2048);
msic = pci_msi_count(dev);
if (bootverbose)
device_printf(dev, "MSI count : %d\n", msic);