[SPDK] Re: Performance impact with "enable_zerocopy_send"

Hello Charlie, Could you add more details about the performance drop? Are you using SPDK target and/or initiator and what is payload size? I would expect some degradation with small payloads, as written it this doc https://www.kernel.org/doc/html/v4.15/networking/msg_zerocopy.html#opport... : "MSG_ZEROCOPY is generally only effective at writes over around 10 KB. " Best regards, Alexey Marchuk -----Original Message----- From: Charlie Li <charlie.li(a)gmail.com&gt; Sent: Wednesday, January 20, 2021 12:41 AM To: Storage Performance Development Kit <spdk(a)lists.01.org&gt; Subject: [SPDK] Performance impact with "enable_zerocopy_send" Hello, In SPDK 20.10, "enable_zerocopy_send" is set to "false" by default. I tried to set "enable_zerocopy_send" to true, but noticed the performance dropped. Is this as expected? My understanding is that setting "enable_zerocopy_send" to true should improve performance. Thanks, Charlie _______________________________________________ SPDK mailing list -- spdk(a)lists.01.org To unsubscribe send an email to spdk-leave(a)lists.01.org