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xen-netback: Aggregate TX unmap operations

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Unmapping causes TLB flushing, therefore we should make it in the largest
possible batches. However we shouldn't starve the guest for too long. So if
the guest has space for at least two big packets and we don't have at least a
quarter ring to unmap, delay it for at most 1 milisec.

Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zoltan Kiss
2014-03-06 21:48:31 +00:00
committed by David S. Miller
parent 093507885a
commit e9275f5e2d
3 changed files with 37 additions and 1 deletions
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2
drivers/net/xen-netback/interface.c
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@@ -408,6 +408,7 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
.desc = i };
vif->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;
}
init_timer(&vif->dealloc_delay);
/*
* Initialise a dummy MAC address. We choose the numerically
@@ -556,6 +557,7 @@ void xenvif_disconnect(struct xenvif *vif)
}
if (vif->dealloc_task) {
del_timer_sync(&vif->dealloc_delay);
kthread_stop(vif->dealloc_task);
vif->dealloc_task = NULL;
}