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authorRusty Russell <rusty@rustcorp.com.au>2008-07-29 09:58:35 -0500
committerRusty Russell <rusty@rustcorp.com.au>2008-07-29 09:58:36 +1000
commita161883a29bf6100efe7b5346bec274e5023c29c (patch)
tree5d5b65172a64789eada0e3b824564a793033d0ad /drivers/watchdog/ep93xx_wdt.c
parent5dae785a82c1a8c05b5b4f9709bd9ce658dcf1b6 (diff)
lguest: Tell Guest net not to notify us on every packet xmit
virtio_ring has the ability to suppress notifications. This prevents a guest exit for every packet, but we need to set a timer on packet receipt to re-check if there were any remaining packets. Here are the times for 1G TCP Guest->Host with different timeout settings (it matters because the TCP window doesn't grow big enough to fill the entire buffer): Timeout value Seconds Xmit/Recv/Timeout None (before) 25.3784 xmit 7750233 recv 1 2500 usec 62.5119 xmit 207020 recv 2 timeout 207020 1000 usec 34.5379 xmit 207003 recv 2 timeout 207003 750 usec 29.2305 xmit 207002 recv 1 timeout 207002 500 usec 19.1887 xmit 561141 recv 1 timeout 559657 250 usec 20.0465 xmit 214128 recv 2 timeout 214110 100 usec 19.2583 xmit 561621 recv 1 timeout 560153 (Note that these values are sensitive to the GSO patches which come later, and probably other traffic-related variables, so take with a large grain of salt). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/watchdog/ep93xx_wdt.c')
0 files changed, 0 insertions, 0 deletions