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Date: Thu, 1 Oct 2009 11:49:39 +0200 From: Nir Tzachar <nir.tzachar@...il.com> To: Arnaldo Carvalho de Melo <acme@...stprotocols.net>, Linux Networking Development Mailing List <netdev@...r.kernel.org> Cc: Ziv Ayalon <ziv@...al.co.il> Subject: Re: [RFCv4 PATCH 2/2] net: Allow protocols to provide an unlocked_recvmsg socket method Hi Arnaldo I have repeated the tests using net-next on top of linus' git tree (I hope I got it right..) and the patches you sent me. Things did not get better, and in most cases were even worse; the recvmmsg parts distinctly showed better throughput, but the latency has more than doubled. The simplest test of using a batch size of 1 results with recvmmsg's latency over 1000 micro, while regular recvmsg is around 450 micro. (note that to use 1 packet there is a small bug in the reg_recv which needs to be fixed. Namely, change ret = -1 to ret = 0). On the previous system config -- part 0001 of the patch, on top of 2.6.31 -- the latency of a single packet batch is 370 micro. So, there seems to be a regression with the kernel tree I am using, or with part 0002 of the path. I'll try running the net-next with only part 1 of the patch and report. Cheers. -- 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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