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Currently a host kick error is silently ignored and not reflected in
the virtqueue of a particular virtio device.
Changing the notify API for guest->host notification seems to be one
prerequisite in order to be able to handle such errors in the context
where the kick is triggered.
This patch changes the notify API. The notify function must return a
bool return value. It returns false if the host notification failed.
Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Make the rest of the paths use virtqueue_add_sgs or add_outbuf.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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As expected, the simplified accessors are faster.
for i in `seq 50`; do /usr/bin/time -f 'Wall time:%e' ./vringh_test --indirect --eventidx --parallel --fast-vringh; done 2>&1 | stats --trim-outliers:
Before:
Using CPUS 0 and 3
Guest: notified 0, pinged 39062-39063(39063)
Host: notified 39062-39063(39063), pinged 0
Wall time:1.760000-2.220000(1.789167)
After:
Using CPUS 0 and 3
Guest: notified 0, pinged 39037-39063(39062)
Host: notified 39037-39063(39062), pinged 0
Wall time:1.640000-1.810000(1.676875)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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This is mainly to test the drivers/vhost/vringh.c code, but it also
uses the drivers/virtio/virtio_ring.c code for the guest side.
Usage for testing the basic implementation:
./vringh_test
# Test with indirect descriptors
./vringh_test --indirect
# Test with indirect descriptors and event indexex
./vringh_test --indirect --eventidx
You can run a parallel stress test by adding --parallel to any of the
above options.
eg ./vringh_test --parallel:
Using CPUS 0 and 3
Guest: notified 10107974, pinged 107970
Host: notified 108158, pinged 3172148
./vringh_test --indirect --eventidx --parallel:
Using CPUS 0 and 3
Guest: notified 156357, pinged 156251
Host: notified 156251, pinged 78179
Average of 50 times doing ./vringh_test --indirect --eventidx --parallel:
2.840000-3.040000(2.927292)user
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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