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Merge pull request #4782 from MichaelEischer/fix-sftp-performance

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Fix sftp upload performance
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Michael Eischer 2024-05-12 15:28:33 +02:00 committed by GitHub
commit b5fdb1d637
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2 changed files with 14 additions and 2 deletions
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7
changelog/unreleased/issue-4209 Normal file
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@ -0,0 +1,7 @@
Bugfix: Fix slow sftp upload performance
Since restic 0.12.1, the upload speed of the sftp backend to a remote server
has regressed significantly. This has been fixed.
https://github.com/restic/restic/issues/4209
https://github.com/restic/restic/pull/4782

9
internal/backend/sftp/sftp.go
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@ -102,7 +102,12 @@ func startClient(cfg Config) (*SFTP, error) {
}()
// open the SFTP session
client, err := sftp.NewClientPipe(rd, wr)
client, err := sftp.NewClientPipe(rd, wr,
// write multiple packets (32kb) in parallel per file
// not strictly necessary as we use ReadFromWithConcurrency
sftp.UseConcurrentWrites(true),
// increase send buffer per file to 4MB
sftp.MaxConcurrentRequestsPerFile(128))
if err != nil {
return nil, errors.Errorf("unable to start the sftp session, error: %v", err)
}
@ -359,7 +364,7 @@ func (r *SFTP) Save(_ context.Context, h backend.Handle, rd backend.RewindReader
}()
// save data, make sure to use the optimized sftp upload method
wbytes, err := f.ReadFrom(rd)
wbytes, err := f.ReadFromWithConcurrency(rd, 0)
if err != nil {
_ = f.Close()
err = r.checkNoSpace(dirname, rd.Length(), err)