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 YUetxLms 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On Mar 16, 2023, at 1:28 PM, David Howells wrote: >=20 > Chuck Lever III wrote: >=20 >> That means I haven't seen the cover letter and do not have any >> context for this proposed change. >=20 > https://lore.kernel.org/linux-fsdevel/20230316152618.711970-1-dhowells@re= dhat.com/ >=20 >> We've tried combining the sendpages calls in here before. It >> results in a significant and measurable performance regression. >> See: >>=20 >> da1661b93bf4 ("SUNRPC: Teach server to use xprt_sock_sendmsg for socket = sends") >=20 > The commit replaced the use of sendpage with sendmsg, but that took away = the > zerocopy aspect of sendpage. The idea behind MSG_SPLICE_PAGES is that it > allows you to do keep that. I'll have to try reapplying this commit and > adding the MSG_SPLICE_PAGES flag. Note that, as Trond point out, NFSD can handle an NFS READ request with either a splice actor or by copying through a vector, depending on what the underlying filesystem can support and whether we are using a security flavor that requires stable pages. Grep for RQ_SPLICE_OK. Eventually we want to make use of iomaps to ensure that reading areas of a file that are not allocated on disk does not trigger an extent allocation. Anna is working on that, but I have no idea what it will look like. We can talk more at LSF, if you'll both be around. Also... I find I have to put back the use of MSG_MORE and friends in here, otherwise kTLS will split each of these kernel_sendsomething() calls into its own TLS record. This code is likely going to look different after support for RPC-with-TLS goes in. >> Therefore, this kind of change needs to be accompanied by both >> benchmark results and some field testing to convince me it won't >> cause harm. >=20 > Yep. >=20 >> And, we have to make certain that this doesn't break operation >> with kTLS sockets... do they support MSG_SPLICE_PAGES ? >=20 > I haven't yet tackled AF_TLS, AF_KCM or AF_SMC as they seem significantly= more > complex than TCP and UDP. I thought I'd get some feedback on what I have > before I tried my hand at those. OK, I didn't mean AF_TLS, I meant the stuff under net/tls, which is AF_INET[6] and TCP, but with a ULP in place. It's got its own sendpage and sendmsg methods that choke when an unrecognized MSG_ flag is present. But OK, you're just asking for feedback, so I'll put my red pencil down. -- Chuck Lever