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Date: Fri, 8 Jun 2007 18:57:25 +0400 From: Evgeniy Polyakov <johnpol@....mipt.ru> To: Jens Axboe <jens.axboe@...cle.com> Cc: David Miller <davem@...emloft.net>, netdev@...r.kernel.org Subject: Re: [PATCH][RFC] network splice receive On Fri, Jun 08, 2007 at 04:14:52PM +0200, Jens Axboe (jens.axboe@...cle.com) wrote: > Here's a start, for the splice side at least of storing a buf-private > entity with the ops. :) I tested the same implementation, but I put skb pointer into page->private. My approach is not correct, since the same page can hold several objects, so if there are several splicers, this will scream. I've tested your patch on top of splice-net branch, here is a result: [ 44.798853] Slab corruption: skbuff_head_cache start=ffff81003b726668, len=192 [ 44.806148] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b. [ 44.811598] Last user: [<ffffffff803699fd>](kfree_skbmem+0x7a/0x7e) [ 44.818012] 0b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6a 6b 6b a5 [ 44.824889] Prev obj: start=ffff81003b726590, len=192 [ 44.829985] Redzone: 0xd84156c5635688c0/0xd84156c5635688c0. [ 44.835604] Last user: [<ffffffff8036a22c>](__alloc_skb+0x40/0x13f) [ 44.842010] 000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 44.848896] 010: 20 58 7e 3b 00 81 ff ff 00 00 00 00 00 00 00 00 [ 44.855772] Next obj: start=ffff81003b726740, len=192 [ 44.860868] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b. [ 44.866314] Last user: [<ffffffff803699fd>](kfree_skbmem+0x7a/0x7e) [ 44.872721] 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b [ 44.879597] 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b I will try some things for the nearest 30-60 minutes, and then will move to canoe trip until thuesday, so will not be able to work on this idea. -- Evgeniy Polyakov - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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