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netvsc: prefetch the first incoming ring element
In interrupt handler, prefetch the first incoming ring element so that it is in cache by the time NAPI poll gets to it. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -30,6 +30,7 @@
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#include <linux/if_ether.h>
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#include <linux/vmalloc.h>
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#include <linux/rtnetlink.h>
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#include <linux/prefetch.h>
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#include <asm/sync_bitops.h>
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@ -1265,10 +1266,15 @@ int netvsc_poll(struct napi_struct *napi, int budget)
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void netvsc_channel_cb(void *context)
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{
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struct netvsc_channel *nvchan = context;
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struct vmbus_channel *channel = nvchan->channel;
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struct hv_ring_buffer_info *rbi = &channel->inbound;
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/* preload first vmpacket descriptor */
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prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
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if (napi_schedule_prep(&nvchan->napi)) {
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/* disable interupts from host */
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hv_begin_read(&nvchan->channel->inbound);
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hv_begin_read(rbi);
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__napi_schedule(&nvchan->napi);
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}
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