Re: [RFC net-next PATCH V1 9/9] net: frag remove readers-writer lock (hack)
From: Stephen Hemminger <hidden>
Date: 2012-11-26 06:04:26
On Fri, 23 Nov 2012 14:08:47 +0100 Jesper Dangaard Brouer [off-list ref] wrote:
Do NOT APPLY this patch. After all the other patches, the rw_lock is now the contention point.
Reader-writer locks are significantly slower than a simple spinlock. Unless the reader holds the lock for "significant" number of cycles, a spin lock will be faster. Did you try just changing it to a spinlock?