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...062] BUG: soft lockup - CPU#0 stuck for 79s! [xend:2767] > Aug 31 13:05:41 nwsc-xen-Q45 kernel: [ 4039.348073] Modules linked in: xt_tcpudp xt_physdev iptable_filter ip_tables x_ta bles ext4 jbd2 crc16 sata_sil24 hid_apple sky2 via_velocity crc_ccitt usb_storage raid456 md_mod async_raid6_recov async_ pq raid6_pq async_xor xor async_memcpy async_tx dm_mod ext3 jbd mbcache firewire_sbp2 loop sr_mod cdrom sg xenfs xen_evtc hn bridge stp 3w_9xxx usbhid hid sd_mod crc_t10dif snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss...

...parallel as the plugin allows. The nbdkit side pulls the request off the socket and if the async function pointer is non-null it will wrap the request in an op struct and use the async plugin call for read/write/etc capturing any buffer allocated and some op details into the op pointer. The plugin async_* will start the op and return to nbdkit while the plugin works on it in the background. Nbdkit will then go back to the socket and begin the next request. Our plugin uses 1 connection/nbdkit thread and 2-4 threads internally with boost asio over sockets to service the requests to cloud. We are able...

...gin allows. The nbdkit side pulls the request off the > socket and if the async function pointer is non-null it will wrap the > request in an op struct and use the async plugin call for read/write/etc > capturing any buffer allocated and some op details into the op pointer. The > plugin async_* will start the op and return to nbdkit while the plugin > works on it in the background. Nbdkit will then go back to the socket and > begin the next request. Our plugin uses 1 connection/nbdkit thread and 2-4 > threads internally with boost asio over sockets to service the requests to &gt...

...the entire cbdkit source to our github at https://github.com/dev-cloudbd/cbdkit The relevant files are include/cbdkit-plugin.h src/connections.c src/plugins.c Specifically, the connections.c functions recv_request send_reply and the plugins.c functions plugin_pread plugin_pwrite cbdkit_async_reply cbdkit_async_reply_read cbdkit_async_reply_error On Fri, Jan 19, 2018 at 12:05 PM, Eric Blake <eblake@redhat.com> wrote: > On 01/19/2018 10:56 AM, Shaun McDowell wrote: > > > Limitation: The kernel will (with today's default settings) typically be > > willing to...

A combination of the work that both Rich and I have been doing lately, where filters use only the new API with flags on every command that the client can send over the wire (we can then add support for more flags in nbdkit without having to add new callbacks, as NBD adds more flags upstream). Eric Blake (4): protocol: Split flags from cmd field in requests backend: Pass flags argument through